mifepristone (Rx)

Pregnancy Termination

Mifeprex: Indicated for the medical termination of intrauterine pregnancy through 70 days gestation in combination with misoprostol

Day 1: 200 mg of mifepristone PO as a single dose under physician supervision

Days 2-3: 800 mcg of misoprostol buccally once as a single dose; must be administered a minimum of 24-hr and a maximum of 48-hr following mifeprostone dose on day 1 (see Administration)

Days 7-14

• Must return for follow-up visit to confirm complete termination has occurred by medical history, clinical examination, hCG testing, or ultrasonographic scan
• If complete expulsion has not occurred, but the pregnancy is not ongoing, women may be treated with another dose of misoprostol 800 mcg buccally with follow-up in ~7 days
• Lack of bleeding following treatment usually indicates failure; however, prolonged or heavy bleeding is not proof of a complete abortion
• Surgical evacuation is recommended to manage ongoing pregnancies after medical abortion

Dosing considerations

• Pregnancy is dated from the first day of the last menstrual period
• Duration of pregnancy may be determined from menstrual history and clinical examination
• Assess the pregnancy by ultrasonographic scan if the duration of pregnancy is uncertain or if ectopic pregnancy is suspected
• Remove any intrauterine device (IUD) before treatment
• Because most women will expel the pregnancy within 2-24 hr of taking misoprostol, discuss with the patient an appropriate location for her to be when she takes the misoprostol, taking into account that expulsion could begin within 2 hr of administration

Cushing Syndrome

Korlym: Indicated to control hyperglycemia secondary to hypercortisolism in adults with endogenous Cushing syndrome who have type 2 diabetes mellitus or glucose intolerance and have failed surgery or are not candidates for surgery

300 mg PO qDay initially; may dose to a maximum of 1200 mg/day, but should not exceed 20 mg/kg/day

Increase in dose should not occur more frequently than every 2-4 weeks and should be based on assessment of glucose control, antidiabetic medication requirements, insulin levels and psychiatric symptoms

Dosage Modifications (Korlym)

Coadministration with strong CYP3A inhibitors: Not to exceed 300 mg/day

Renal impairment: No change in initial dose; limit maximum dose to 600 mg PO qDay

Hepatic impairment

• Mild-to-moderate: No change in initial dose; limit maximum dose to 600 mg PO qDay
• Severe: Do not use

Ovarian Cancer (Orphan)

Korlym: Orphan designation for treatment of ovarian cancer

Sponsor

• Corcept Therapeutics, Inc; 149 Commonwealth Drive; Menlo Park, California 94025

Safety and efficacy not established

Contraindicated (61)

• alfuzosin

  mifepristone will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• antithrombin alfa

  mifepristone, antithrombin alfa. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• antithrombin III

  mifepristone, antithrombin III. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• apixaban

  mifepristone increases toxicity of apixaban by anticoagulation. Contraindicated.

• argatroban

  mifepristone, argatroban. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• aspirin

  aspirin, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).

• aspirin rectal

  aspirin rectal, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).

• aspirin/citric acid/sodium bicarbonate

  aspirin/citric acid/sodium bicarbonate, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).

• bemiparin

  mifepristone, bemiparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• bivalirudin

  mifepristone, bivalirudin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• budesonide

  mifepristone, budesonide. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• cisapride

  mifepristone, cisapride. QTc interval. Contraindicated.

• clobetasone

  mifepristone, clobetasone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• conivaptan

  mifepristone will increase the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• cortisone

  mifepristone, cortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• cyclosporine

  mifepristone increases levels of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• dabigatran

  mifepristone, dabigatran. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• dalteparin

  mifepristone, dalteparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• deflazacort

  mifepristone, deflazacort. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• dexamethasone

  mifepristone, dexamethasone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• dihydroergotamine

  mifepristone increases levels of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• dihydroergotamine intranasal

  mifepristone increases levels of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• dronedarone

  mifepristone, dronedarone. QTc interval. Contraindicated.

• eletriptan

  mifepristone will increase the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• enoxaparin

  mifepristone, enoxaparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• eplerenone

  mifepristone will increase the level or effect of eplerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ergoloid mesylates

  mifepristone will increase the level or effect of ergoloid mesylates by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ergonovine

  mifepristone will increase the level or effect of ergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ergotamine

  mifepristone increases levels of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• finerenone

  mifepristone will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• fludrocortisone

  mifepristone, fludrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• fondaparinux

  mifepristone, fondaparinux. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• goserelin

  goserelin increases toxicity of mifepristone by QTc interval. Contraindicated. Increases risk of torsades de pointes.

• heparin

  mifepristone, heparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• hydrocortisone

  mifepristone, hydrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• lefamulin

  lefamulin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lefamulin is contraindicated with CYP3A substrates know to prolong the QT interval.

• lepirudin

  mifepristone, lepirudin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• leuprolide

  leuprolide increases toxicity of mifepristone by QTc interval. Contraindicated. Increases risk of torsades de pointes.

• lonafarnib

  mifepristone will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lonafarnib is a sensitive CYP3A4 substrate. Coadministration with strong or moderate CYP3A4 inhibitors is contraindicated.

• lovastatin

  mifepristone increases levels of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated due to increased risk of rhabdomyolysis.

• methylergonovine

  mifepristone will increase the level or effect of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• methylprednisolone

  mifepristone, methylprednisolone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• mometasone topical

  mifepristone, mometasone topical. Either increases toxicity of the other by Other (see comment). Contraindicated. Comment: Mifepristone is contraindicated in patients on long-term corticosteriod treatment due to increase risk of adrenal insufficiency.

• naloxegol

  mifepristone will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• norethindrone

  mifepristone will increase the level or effect of norethindrone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• phenindione

  mifepristone, phenindione. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• pimozide

  mifepristone increases levels of pimozide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index; combination may prolong QT interval .

• prednisolone

  mifepristone, prednisolone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• prednisone

  mifepristone, prednisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• protamine

  mifepristone, protamine. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• quinidine

  mifepristone increases levels of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index; combination may prolong QT interval .

• rivaroxaban

  mifepristone increases toxicity of rivaroxaban by anticoagulation. Contraindicated.

• simvastatin

  mifepristone increases levels of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated due to increased risk of rhabdomyolysis.
  
  mifepristone increases toxicity of simvastatin by Other (see comment). Contraindicated. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• sirolimus

  mifepristone increases levels of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• tacrolimus

  mifepristone increases levels of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• thioridazine

  mifepristone, thioridazine. QTc interval. Contraindicated.

• tinzaparin

  mifepristone, tinzaparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• triamcinolone acetonide injectable suspension

  mifepristone, triamcinolone acetonide injectable suspension. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• triazolam

  mifepristone will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• voclosporin

  mifepristone will increase the level or effect of voclosporin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• warfarin

  mifepristone, warfarin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

Serious - Use Alternative (165)

• abametapir

  abametapir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.

• afatinib

  mifepristone increases levels of afatinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Reduce afatinib daily dose by 10 mg if not tolerated when coadministered with P-gp inhibitors.

• alfentanil

  mifepristone will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• alfuzosin

  mifepristone and alfuzosin both increase QTc interval. Avoid or Use Alternate Drug. Use alternatives if available

• amiodarone

  mifepristone will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• apalutamide

  apalutamide will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.
  
  mifepristone will increase the level or effect of apalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. No initial dose adjustment

• aprepitant

  mifepristone will increase the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• armodafinil

  mifepristone will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• artemether/lumefantrine

  mifepristone will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• aspirin

  aspirin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• atorvastatin

  mifepristone increases toxicity of atorvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• avanafil

  mifepristone will increase the level or effect of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• avapritinib

  mifepristone will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of avapritinib with strong CYP3A4 inhibitors.

• benzhydrocodone/acetaminophen

  mifepristone will increase the level or effect of benzhydrocodone/acetaminophen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration with strong CYP3A4 inhibitors may increase hydrocodone (benzhydrocodone is prodrug of hydrocodone) plasma concentrations and can result in potentially fatal respiratory depression.

• bosentan

  mifepristone will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• bromocriptine

  mifepristone will increase the level or effect of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• budesonide

  mifepristone will increase the level or effect of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• buprenorphine

  mifepristone will increase the level or effect of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• buprenorphine transdermal

  mifepristone will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• calcitriol

  mifepristone will increase the level or effect of calcitriol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• capmatinib

  mifepristone will increase the level or effect of capmatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• carbamazepine

  mifepristone will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  carbamazepine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cariprazine

  mifepristone will increase the level or effect of cariprazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong mifepristone initiated, reduce current dosage of cariprazine by half; if patient is already taking the CYP3A4 inhibitor and initiating cariprazine, follow manufacturer?s recommendation

• chloramphenicol

  chloramphenicol will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cilostazol

  mifepristone will increase the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cisapride

  mifepristone will increase the level or effect of cisapride by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• clarithromycin

  mifepristone will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• colchicine

  mifepristone will increase the level or effect of colchicine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid use of colchicine with strong CYP3A4 inhibitors. If coadministration is necessary, decrease colchicine dose or frequency as recommended in prescribing information. Use of any colchicine product in conjunction with strong CYP3A4 inhibitors is contraindicated in patients with renal or hepatic impairment.

• copanlisib

  mifepristone will increase the level or effect of copanlisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• crizotinib

  mifepristone will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Increase in crizotinib levels may result in QT prolongation

• dabrafenib

  mifepristone will increase the level or effect of dabrafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• dasatinib

  mifepristone will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration necessary, concomitant use of mifepristone not recommended in patients receiving dasatinib 40-60 mg daily; consider a dasatinib dose reduction to 40 mg PO daily if original dose was 140 mg daily, 20 mg PO daily if original dose was 100 mg daily, or 20 mg PO daily if original dose was 70 mg daily; If dasatinib is not tolerated after dose reduction, consider alternative therapies; if mifepristone stopped, wait approximately 1 week before increasing dasatinib dose

• deflazacort

  mifepristone will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Decrease dose by one third if combination cannot be avoided

• dexamethasone

  mifepristone will increase the level or effect of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• diazepam

  mifepristone will increase the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• disopyramide

  mifepristone will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• dofetilide

  dofetilide increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug.

• dronedarone

  mifepristone will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• efavirenz

  mifepristone will increase the level or effect of efavirenz by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  efavirenz will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eliglustat

  mifepristone will increase the level or effect of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eluxadoline

  mifepristone increases levels of eluxadoline by decreasing metabolism. Avoid or Use Alternate Drug. Decrease eluxadoline dose to 75 mg PO BID if coadministered with OATP1B1 inhibitors. .

• elvitegravir

  mifepristone will increase the level or effect of elvitegravir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  mifepristone will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• encorafenib

  mifepristone will increase the level or effect of encorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concomitant use of a strong CYP3A4 inhibitor is unavoidable, reduce encorafenib dose to one-third of the dose (eg, reduce from 450 mg/day to 150 mg/day). After discontinuing the inhibitor for 3-5 elimination half-lives, resume previous encorafenib dose.
  
  encorafenib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Encorafenib is associated with dose-dependent QTc interval prolongation. Avoid with drugs known to prolong QT interval.

• entrectinib

  mifepristone and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of strong CYP3A4 inhibitors with entrectinib, a CYP3A4 substrate. If coadministration unavoidable, reduce entrectinib dose to 100 mg/day for patients aged 12 y or older with BSA >1.50m2. Resume previous entrectinib dose after discontinuing strong CYP3A inhibitor for 3-5 elimination half-lives.

• enzalutamide

  mifepristone will increase the level or effect of enzalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  enzalutamide will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erdafitinib

  mifepristone will increase the level or effect of erdafitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid coadministration with strong CYP3A4 inhibitors, monitor closely for adverse reactions and consider decreasing dose accordingly. If strong CYP3A4 inhibitor is discontinued, consider increasing erdafitinib dose in the absence of any drug-related toxicities.

• erythromycin base

  mifepristone will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  mifepristone will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  mifepristone will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin stearate

  mifepristone will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eszopiclone

  mifepristone will increase the level or effect of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ethinylestradiol

  mifepristone will increase the level or effect of ethinylestradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ethosuximide

  mifepristone will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• everolimus

  mifepristone will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fedratinib

  mifepristone will increase the level or effect of fedratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid fedratinib coadministration with strong CYP3A4 inhibitors, decrease fedratinib dose to 200 mg/day. If CYP3A4 inhibitor discontinued, increase fedratinib dose to 300 mg/day for 2 weeks, and then 400 mg/day thereafter as tolerated.

• felbamate

  mifepristone will increase the level or effect of felbamate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• felodipine

  mifepristone will increase the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fentanyl intranasal

  mifepristone will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fentanyl transdermal

  mifepristone will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fentanyl transmucosal

  mifepristone will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fexinidazole

  mifepristone will decrease the level or effect of fexinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid coadministration, monitor fexinidazole for decreased efficacy owing to decreased plasma concentrations of active M1 and M2 metabolites.
  
  fexinidazole and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels or prolong QT interval.

• flurazepam

  mifepristone will increase the level or effect of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fluvastatin

  mifepristone increases toxicity of fluvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; OATP1B1 inhibitors may increase risk of myopathy.

• fosamprenavir

  mifepristone will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• gilteritinib

  mifepristone will increase the level or effect of gilteritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider alternatives to any strong CYP3A4 inhibitor when coadministered with gilteritinib. If such a combination cannot be avoided, closely monitor for gilteritinib-related adverse effects. Interrupt and reduce gilteritinib dosage in patients with serious or life-threatening toxicity.

• glasdegib

  mifepristone will increase the level or effect of glasdegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider alternate therapies that are not strong CYP3A inhibitors or monitor for increased risk of adverse effects, including QTc interval prolongation.
  
  mifepristone and glasdegib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, monitor for increased risk of QTc interval prolongation.

• guanfacine

  mifepristone will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• haloperidol

  mifepristone will increase the level or effect of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• histrelin

  histrelin increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Increases risk of torsades de pointes.

• hydroxychloroquine sulfate

  hydroxychloroquine sulfate and mifepristone both increase QTc interval. Avoid or Use Alternate Drug.

• hydroxyprogesterone caproate

  mifepristone will increase the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ibrutinib

  mifepristone will increase the level or effect of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• idelalisib

  idelalisib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

• imatinib

  mifepristone will increase the level or effect of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• infigratinib

  mifepristone will increase the level or effect of infigratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• inotuzumab

  inotuzumab and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. If unable to avoid concomitant use, obtain ECGs and electrolytes before and after initiation of any drug known to prolong QTc, and periodically monitor as clinically indicated during treatment.

• irinotecan

  mifepristone will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration and for at least 1 week prior to initiating therapy unless no therapeutic alternatives

• irinotecan liposomal

  mifepristone will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. UGT1A1 inhibitors decrease irinotecan metabolism

• isosorbide dinitrate

  mifepristone will increase the level or effect of isosorbide dinitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• isosorbide mononitrate

  mifepristone will increase the level or effect of isosorbide mononitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• itraconazole

  mifepristone will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ivosidenib

  mifepristone will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of strong CYP3A4 inhibitors with ivosidenib or replace with alternate therapies. If coadministration of a strong CYP3A4 inhibitor is unavoidable, reduce ivosidenib dose to 250 mg qDay. If the strong inhibitor is discontinued, increase ivosidenib dose (after at least 5 half-lives of the strong CYP3A4 inhibitor) to the recommended dose of 500 mg qDay. Monitor for increased risk of QTc interval prolongation.
  
  ivosidenib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of QTc prolonging drugs with ivosidenib or replace with alternate therapies. If coadministration of a QTc prolonging drug is unavoidable, monitor for increased risk of QTc interval prolongation.
  
  ivosidenib will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternative therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• ixabepilone

  mifepristone will increase the level or effect of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients receiving CYP3A4 inhibitors during treatment with ixabepilone for acute toxicities (eg, frequent monitoring of peripheral blood counts between cycles of ixabepilone); consider, a dose reduction of ixabepilone in some patients

• ketamine

  mifepristone will increase the level or effect of ketamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ketoconazole

  ketoconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• larotrectinib

  mifepristone will increase the level or effect of larotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration of larotrectinib with strong CYP3A4 inhibitors is unavoidable, reduce larotrectinib dose by 50%. Resume prior larotrectinib dose once CYP3A4 inhibitor discontinued for 3-5 half-lives.

• lefamulin

  mifepristone will increase the level or effect of lefamulin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of lefamulin with strong CYP3A inhibitors.

• lemborexant

  mifepristone will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of lemborexant with moderate or strong CYP3A inhibitors.

• levomilnacipran

  mifepristone will increase the level or effect of levomilnacipran by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• levonorgestrel intrauterine

  mifepristone will increase the level or effect of levonorgestrel intrauterine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• levonorgestrel oral

  mifepristone will increase the level or effect of levonorgestrel oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• lorlatinib

  mifepristone will increase the level or effect of lorlatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministering lorlatinib with strong CYP3A inhibitors. If unavoidable, reduce lorlatinib dose by 25 mg/day. If strong CYP3A inhibitor discontinued, increase to previous lorlatinib (dose after 3 plasma half-lives of strong CYP3A inhibitor). See monograph for further details.
  
  lorlatinib will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• lurbinectedin

  lurbinectedin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of lurbinectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• macimorelin

  macimorelin and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Macimorelin causes an increase of ~11 msec in the corrected QT interval. Avoid coadministration with drugs that prolong QT interval, which could increase risk for developing torsade de pointes-type ventricular tachycardia. Allow sufficient washout time of drugs that are known to prolong the QT interval before administering macimorelin.
  
  mifepristone will increase the level or effect of macimorelin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• medroxyprogesterone

  mifepristone will increase the level or effect of medroxyprogesterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• mefloquine

  mefloquine increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Mefloquine may enhance the QTc prolonging effect of high risk QTc prolonging agents.
  
  mifepristone will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• mestranol

  mifepristone will increase the level or effect of mestranol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• methadone

  mifepristone will increase the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• methylprednisolone

  mifepristone will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• midazolam intranasal

  mifepristone will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of strong CYP3A4 inhibitors with midazolam intranasal causes higher midazolam systemic exposure, which may prolong sedation.

• midostaurin

  mifepristone will increase the level or effect of midostaurin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nicardipine

  mifepristone will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nilotinib

  mifepristone will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nisoldipine

  mifepristone will increase the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• norgestrel

  mifepristone decreases effects of norgestrel by pharmacodynamic antagonism. Contraindicated. Backup contraceptive method recommended.

• olaparib

  mifepristone will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concomitant use necessary, reduce dose of olaparib to 100 mg twice daily; original dose may be resumed 3 to 5 elimination half-lives after mifepristone is discontinued

• ombitasvir/paritaprevir/ritonavir

  mifepristone will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ombitasvir/paritaprevir/ritonavir & dasabuvir

  mifepristone will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ondansetron

  mifepristone will increase the level or effect of ondansetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• osimertinib

  mifepristone will increase the level or effect of osimertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• paclitaxel

  mifepristone will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• paclitaxel protein bound

  mifepristone will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• palbociclib

  mifepristone will increase the level or effect of palbociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• panobinostat

  mifepristone and panobinostat both increase QTc interval. Avoid or Use Alternate Drug. Panobinostat is known to significantly prolong QT interval. Panobinostat prescribing information states use with drugs known to prolong QTc is not recommended.
  
  mifepristone will increase the level or effect of panobinostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pazopanib

  mifepristone will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pemigatinib

  mifepristone will increase the level or effect of pemigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pemigatinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pemigatinib dose.

• pexidartinib

  mifepristone will increase the level or effect of pexidartinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pexidartinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pexidartinib dose.

• pimavanserin

  mifepristone and pimavanserin both increase QTc interval. Avoid or Use Alternate Drug. Coadministration may increase the risk of QT prolongation and cardiac arrhythmia.
  
  mifepristone will increase the level or effect of pimavanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pitolisant

  mifepristone and pitolisant both increase QTc interval. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of pitolisant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pomalidomide

  mifepristone increases levels of pomalidomide by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

• ponatinib

  mifepristone will increase the level or effect of ponatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pralsetinib

  mifepristone will increase the level or effect of pralsetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• primaquine

  mifepristone will increase the level or effect of primaquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• quetiapine

  mifepristone will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• quinine

  mifepristone will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rabeprazole

  mifepristone will increase the level or effect of rabeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ranolazine

  mifepristone will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• regorafenib

  mifepristone will increase the level or effect of regorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ribociclib

  ribociclib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifabutin

  mifepristone will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rimegepant

  mifepristone will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• riociguat

  mifepristone will increase the level or effect of riociguat by decreasing metabolism. Avoid or Use Alternate Drug. Coadministration of riociguat (substrate of CYP isoenzymes 1A1, 2C8, 3A, 2J2) with strong CYP inhibitors may require a decreased initial dose of 0.5 mg PO TID; monitor for signs of hypotension and reduce dose if needed

• romidepsin

  mifepristone will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rosuvastatin

  mifepristone increases toxicity of rosuvastatin by Other (see comment). Avoid or Use Alternate Drug.

• saquinavir

  mifepristone will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• selumetinib

  mifepristone will increase the level or effect of selumetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors cannot be avoided, reduce selumetinib dosage (refer to selumetinib monograph for further information). After discontinuation of the strong or moderate CYP3A4 inhibitor for 3 elimination half-lives, resume selumetinib dose that was taken before initiating the inhibitor.

• sildenafil

  mifepristone will increase the level or effect of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• siponimod

  mifepristone will increase the level or effect of siponimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of siponimod with a moderate or strong CYP3A4 inhibitor PLUS a moderate or strong CYP2C9 inhibitor is not recommended.

• sonidegib

  mifepristone will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• stiripentol

  mifepristone will increase the level or effect of stiripentol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• suvorexant

  mifepristone will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tazemetostat

  mifepristone will increase the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of tazemetostat with strong CYP3A4 inhibitors.

• teniposide

  mifepristone will increase the level or effect of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tezacaftor

  mifepristone will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tiagabine

  mifepristone will increase the level or effect of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tipranavir

  tipranavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tolterodine

  mifepristone will increase the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration necessary in chronic mifepristone therapy, reduce dose of tolterodine IR to 1 mg twice daily and tolterodine ER to 2 mg once daily; monitor for QT prolongation

• tolvaptan

  mifepristone will increase the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• toremifene

  mifepristone will increase the level or effect of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• trabectedin

  mifepristone will increase the level or effect of trabectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• trazodone

  mifepristone will increase the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• triptorelin

  triptorelin increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Increases risk of torsades de pointes.

• tucatinib

  mifepristone will increase the level or effect of tucatinib by Other (see comment). Avoid or Use Alternate Drug. Coadministration of tucatinib (a CYP2C8 substrate) with a strong or moderate CYP2C8 inhibitors increases tucatinib plasma concentrations and risk of toxicities.
  
  tucatinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of tucatinib with CYP3A substrates, where minimal concentration changes may lead to serious or life-threatening toxicities. If unavoidable, reduce CYP3A substrate dose according to product labeling.

• ubrogepant

  mifepristone will increase the level or effect of ubrogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ulipristal

  mifepristone will increase the level or effect of ulipristal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• umeclidinium bromide/vilanterol inhaled

  mifepristone increases toxicity of umeclidinium bromide/vilanterol inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.

• valbenazine

  mifepristone will increase the level or effect of valbenazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vandetanib

  mifepristone will increase the level or effect of vandetanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vardenafil

  mifepristone will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vemurafenib

  mifepristone will increase the level or effect of vemurafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• venetoclax

  mifepristone will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vilanterol/fluticasone furoate inhaled

  mifepristone increases toxicity of vilanterol/fluticasone furoate inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.
  
  mifepristone will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• voriconazole

  mifepristone will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• voxelotor

  mifepristone will increase the level or effect of voxelotor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor is primarily metabolized by CYP3A4. Avoid coadministration with strong CYP3A4 inhibitors. If unable to avoid coadministration, reduce voxelotor dose (see Dosage Modifications).
  
  voxelotor will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

Monitor Closely (299)

• abemaciclib

  mifepristone will increase the level or effect of abemaciclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Patients who have had dose reduction to 100 mg twice daily due to adverse reactions, may further reduce dose of abemaciclib to 50 mg PO twice daily; discontinue abemaciclib for patients unable to tolerate 50 mg twice daily; if mifepristone is discontinued, increase dose of abemaciclib to original dose after 3 to 5 half-lives of mifepristone

• acalabrutinib

  mifepristone will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If mifepristone use necessary, limit dose of acalabrutinib to 100 mg once daily and monitor closely for drug-related toxicity and need for further adjustment or interruption of acalbrutinib therapy

• ado-trastuzumab emtansine

  mifepristone will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, closely monitor patients for ado-trastuzumab emtansine-related adverse reactions

• alprazolam

  mifepristone will increase the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amiodarone

  mifepristone will increase the level or effect of amiodarone by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if available

• amitriptyline

  mifepristone, amitriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• amlodipine

  mifepristone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amobarbital

  amobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amoxapine

  mifepristone, amoxapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• apixaban

  mifepristone will increase the level or effect of apixaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce apixaban dose by 50% when mifepristone used for treatment of Cushing's disease or other hormonal conditions; if patients are already receiving 2.5 mg twice daily, avoid coadministration

• apomorphine

  mifepristone, apomorphine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• aprepitant

  aprepitant will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• arformoterol

  mifepristone, arformoterol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• aripiprazole

  mifepristone will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If these drugs must be used together, follow manufacturer recommendations

• arsenic trioxide

  mifepristone, arsenic trioxide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• artemether

  mifepristone, artemether. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• artemether/lumefantrine

  mifepristone, artemether/lumefantrine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• asenapine

  mifepristone, asenapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• atazanavir

  atazanavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors. Potential for increased toxicity
  
  mifepristone will increase the level or effect of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• atorvastatin

  mifepristone will increase the level or effect of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose of atorvastatin should not exceed 40 mg/day, when administered with a strong CYP3A4 inhibitor

• avatrombopag

  mifepristone will increase the level or effect of avatrombopag by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. When treating ITP, reduce starting dose of avatrombopag to 20 mg PO 3 times weekly when used concomitantly with mifepristone; in patients starting mifepristone while receiving avatrombopag, monitor platelet counts and adjust avatrombopag dose as necessary; coadministration of avatrombopag with a moderate or strong dual CYP2C9/3A4 inhibitor requires a decreased avatrombopag starting dose. Refer to manufacturer recommendations.

• axitinib

  mifepristone increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• azithromycin

  mifepristone, azithromycin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• bedaquiline

  mifepristone and bedaquiline both increase QTc interval. Modify Therapy/Monitor Closely. ECG should be monitored closely
  
  mifepristone will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid concurrent use of bedaquiline for more than 14 days unless benefits justify risks

• boceprevir

  boceprevir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors

• bortezomib

  mifepristone will increase the level or effect of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• bosentan

  bosentan will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• brentuximab vedotin

  mifepristone will increase the level or effect of brentuximab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• brexpiprazole

  mifepristone will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• brigatinib

  mifepristone will increase the level or effect of brigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, reduce dose of brigatinib by approximately 50% without breaking tablets (ie, from 180 mg to 90 mg; from 90 mg to 60 mg); after discontinuation of mifepristone, resume brigatinib dose that was tolerated prior to initiation of mifepristone

• bupropion

  mifepristone will increase the level or effect of bupropion by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• buspirone

  mifepristone will increase the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If buspirone needs to be administered concurrently, a low dose of buspirone (ie, 2.5 mg PO twice daily) recommended initially; base subsequent dosage adjustments on clinical response

• cabozantinib

  mifepristone will increase the level or effect of cabozantinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, reduce dose of cabozantinib; for patients taking cabozantinib tablets, reduce dose by 20 mg (eg, 60 mg/day to 40 mg/day; 40 mg/day to 20 mg/day); for patients taking cabozantinib capsules, reduce dose by 40 mg (eg, 140 mg/day to 100 mg/day or 100 mg/day to 60 mg/day); resume cabozantinib dose that was used prior to initiating treatment with mifepristone 2 to 3 days after discontinuation of mifepristone

• calcifediol

  mifepristone will increase the level or effect of calcifediol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cannabidiol

  mifepristone will increase the level or effect of cannabidiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Consider reducing the cannabidiol dose when coadministered with a strong CYP3A4 inhibitor.

• carbamazepine

  carbamazepine, mifepristone. Other (see comment). Use Caution/Monitor. Comment: Carbamazepine may decrease mifepristone levels via CYP3A4 induction; additionally, mifepristone may increase carbamazepine levels by inhibiting CYP2C8/2C9.

• cenobamate

  cenobamate will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• ceritinib

  mifepristone increases levels of ceritinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  mifepristone, ceritinib. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. May increase QT prolongation.

• chloroquine

  mifepristone will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• chlorpromazine

  mifepristone, chlorpromazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• cholic acid

  mifepristone increases toxicity of cholic acid by decreasing elimination. Modify Therapy/Monitor Closely. Avoid concomitant use of inhibitors of the bile salt efflux pump (BSEP). May exacerbate accumulation of conjugated bile salts in the liver and result in clinical symptoms. If concomitant use is necessary, monitor serum transaminases and bilirubin.

• ciclesonide inhaled

  mifepristone will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ciprofloxacin

  ciprofloxacin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Use alternatives if available.

• citalopram

  mifepristone, citalopram. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concurrent therapy considered essential, ECG monitoring recommended

• clarithromycin

  clarithromycin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if available

• clomipramine

  mifepristone, clomipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• clonazepam

  mifepristone will increase the level or effect of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• clozapine

  mifepristone, clozapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• cobicistat

  cobicistat will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, administer 300 mg mifepristone initially; not to exceed 600 mg; if cobicistat initiated in patient receiving 600 mg mifepristone, reduce mirepristone dose to 300 mg; if cobicistat initiated in patient receiving 900-1200 mg mifepristone, reduce mifepristone dose to 600 mg; if initiated in patient receiving 300 mg mifepristone, no change in dose necessary

• cobimetinib

  mifepristone will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If short-term coadministration (14 days or less) of mifepristone necessary, reduce dose of cobimetinib to 20 mg once daily for patients normally taking 60 mg daily; after discontinuation of mifepristone, resume cobimetinib at previous dose; use alternative to mifepristone in patients who are already taking a reduced dose of cobimetinib (20-40 mg daily)

• conivaptan

  conivaptan will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors

• conjugated estrogens

  mifepristone will increase the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• crizotinib

  mifepristone, crizotinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• cyclophosphamide

  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• daclatasvir

  mifepristone will increase the level or effect of daclatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dapsone

  mifepristone will increase the level or effect of dapsone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• darifenacin

  mifepristone will increase the level or effect of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. In adults receiving mifepristone chronically for treatment of hormonal conditions, daily dose of darifenacin should not exceed 7.5 mg/day PO

• darunavir

  darunavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• dasatinib

  mifepristone, dasatinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• degarelix

  mifepristone, degarelix. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• delavirdine

  mifepristone will increase the level or effect of delavirdine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• desipramine

  mifepristone, desipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• desogestrel

  mifepristone decreases effects of desogestrel by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• deutetrabenazine

  mifepristone and deutetrabenazine both increase QTc interval. Modify Therapy/Monitor Closely. For patients requiring deutetrabenazine doses >24 mg/day and are taking other drugs known to prolong QTc, assess the QTc interval before and after increasing the dose of deutetrabenazine or other medications known to prolong QTc.

• diazepam intranasal

  mifepristone will increase the level or effect of diazepam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong or moderate CYP3A4 inhibitors may decrease rate of diazepam elimination, thereby increasing adverse reactions to diazepam.

• dichlorphenamide

  dichlorphenamide and mifepristone both decrease serum potassium. Use Caution/Monitor.

• diclofenac topical

  mifepristone will increase the level or effect of diclofenac topical by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• dienogest/estradiol valerate

  mifepristone will increase the level or effect of dienogest/estradiol valerate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for potential adverse effects such as nausea, irregular uterine bleeding, breast tenderness and headache.
  
  mifepristone decreases effects of dienogest/estradiol valerate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• diltiazem

  diltiazem will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of mifepristone, CYP3A4 inhibitor with diltiazem, CYP3A4 substrate may increase plasma concentrations of diltiazem. Discontinuation or dose reduction of diltiazem may be necessary with mifepristone coadministration.
  
  mifepristone will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• disopyramide

  mifepristone, disopyramide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• docetaxel

  mifepristone will increase the level or effect of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Closely monitor for docetaxel-related adverse reactions and consider 50% dose reduction of docetaxel if concomitant use of docetaxel with chronic mifepristone necessary; clinical significance of this interaction with short-term use of mifepristone for termination of pregnancy unknown

• dofetilide

  mifepristone, dofetilide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• dolasetron

  mifepristone, dolasetron. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• doravirine

  mifepristone will increase the level or effect of doravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of doravirine and CYP3A4 inhibitors may increase plasma concentrations and toxicities of doravirine.

• doxepin cream

  mifepristone will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• doxorubicin

  mifepristone will increase the level or effect of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• doxorubicin liposomal

  mifepristone will increase the level or effect of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dronabinol

  mifepristone will increase the level or effect of dronabinol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• droperidol

  mifepristone, droperidol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• drospirenone

  mifepristone decreases effects of drospirenone by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• duvelisib

  mifepristone will increase the level or effect of duvelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with a strong CYP3A4 inhibitor increases duvelisib AUC, which may increase the risk of duvelisib toxicities. Reduce duvelisib dose to 15 mg BID when coadministered with a strong CYP3A4 inhibitor.
  
  duvelisib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with duvelisib increases AUC of a sensitive CYP3A4 substrate which may increase the risk of toxicities of these drugs. Consider reducing the dose of the sensitive CYP3A4 substrate and monitor for signs of toxicities of the coadministered sensitive CYP3A substrate.

• efavirenz

  efavirenz, mifepristone. Other (see comment). Use Caution/Monitor. Comment: Efavirenz shown in vitro to induce CYP3A4 and CYP2B6, but in vitro has been shown to inhibit CYP3A4 and therefore may affect mifepristone levels/effect; mifepristone inhibits CYP2B6, therefore increasing exposure of efavirenz.

• elagolix

  mifepristone will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of elagolix 200 mg BID with strong CYP3A inhibitors for >1 month is not recommended. Limit elagolix dose to 150 mg qDay and CYP3A inhibitor duration of use to 6 months if coadministered.
  
  elagolix decreases levels of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

• elbasvir/grazoprevir

  mifepristone will increase the level or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• encorafenib

  encorafenib, mifepristone. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.

• enfortumab vedotin

  mifepristone increases toxicity of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Enfortumab vedotin is an antibody-drug conjugate that releases monomethylauristatin E (MMAE) via proteolytic cleavage. MMAE is primarily metabolized by CYP3A4 in vitro. Coadministration with strong CYP3A4 inhibitors may increase free MMAE exposure, which may increase the incidence or severity of toxicities.

• erlotinib

  mifepristone will increase the level or effect of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce dose of erlotinib by 50 mg decrements If concomitant use necessary and severe reactions occur; clinical significance of this interaction with short-term use of mifepristone for termination of pregnancy unknown

• erythromycin base

  erythromycin base will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin base. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• erythromycin ethylsuccinate

  erythromycin ethylsuccinate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin ethylsuccinate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• erythromycin lactobionate

  erythromycin lactobionate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin lactobionate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• erythromycin stearate

  erythromycin stearate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin stearate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• escitalopram

  mifepristone, escitalopram. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  escitalopram increases toxicity of mifepristone by QTc interval. Use Caution/Monitor.

• eslicarbazepine acetate

  eslicarbazepine acetate will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• estradiol

  mifepristone will increase the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estrogens conjugated synthetic

  mifepristone will increase the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estrogens esterified

  mifepristone will increase the level or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estropipate

  mifepristone will increase the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ethinylestradiol

  mifepristone decreases effects of ethinylestradiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• etoposide

  mifepristone will increase the level or effect of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• etravirine

  etravirine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer
  
  mifepristone will increase the level or effect of etravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• etynodiol

  mifepristone decreases effects of etynodiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• exemestane

  mifepristone will increase the level or effect of exemestane by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ezogabine

  mifepristone, ezogabine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• famotidine

  famotidine, mifepristone. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.
  
  mifepristone, famotidine. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.

• fedratinib

  fedratinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

• fentanyl

  mifepristone will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• ferrous fumarate

  mifepristone decreases effects of ferrous fumarate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• flecainide

  mifepristone, flecainide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• flibanserin

  mifepristone will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased flibanserin adverse effects may occur if coadministered with multiple weak CYP3A4 inhibitors.

• fluconazole

  fluconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, fluconazole. Either increases toxicity of the other by QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• flunisolide inhaled

  mifepristone will increase the level or effect of flunisolide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fluoxetine

  mifepristone, fluoxetine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fluphenazine

  mifepristone, fluphenazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fluticasone furoate inhaled

  mifepristone will increase the level or effect of fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong CYP3A4 inhibitors may increase fluticasone systemic exposure

• fluticasone inhaled

  mifepristone will increase the level or effect of fluticasone inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong CYP3A4 inhibitors may increase fluticasone systemic exposure

• formoterol

  mifepristone, formoterol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fosamprenavir

  fosamprenavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.

• foscarnet

  mifepristone, foscarnet. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fosphenytoin

  fosphenytoin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• fostamatinib

  mifepristone will increase the level or effect of fostamatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Strong CYP3A4 inhibitors may increase exposure to R406 (fostamatinib major active metabolite). Monitor for toxicities that may require fostamatinib dose reduction.

• fostemsavir

  mifepristone and fostemsavir both increase QTc interval. Use Caution/Monitor. QTc prolongation reported with higher than recommended doses of fostemsavir.

• gefitinib

  mifepristone will increase the level or effect of gefitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• gemifloxacin

  mifepristone, gemifloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• gemtuzumab

  mifepristone and gemtuzumab both increase QTc interval. Use Caution/Monitor.

• glecaprevir/pibrentasvir

  mifepristone will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• grapefruit

  grapefruit will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• haloperidol

  mifepristone, haloperidol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• hydrocodone

  mifepristone will increase the level or effect of hydrocodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ibuprofen/famotidine

  ibuprofen/famotidine, mifepristone. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.
  
  mifepristone, ibuprofen/famotidine. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.

• ibutilide

  mifepristone, ibutilide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• idelalisib

  mifepristone will increase the level or effect of idelalisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• ifosfamide

  mifepristone will decrease the level or effect of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of CYP3A4 inhibitors may decrease the metabolism of ifosfamide to its active alkylating metabolites and decrease the efficacy of ifosfamide.
  
  mifepristone will decrease the level or effect of ifosfamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor. Coadministration of ifosfamide with CYP2B6 inhibitors may decrease metabolism of ifosfamide to its metabolite, potentially reducing ifosfamide therapeutic effects.

• iloperidone

  mifepristone, iloperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• imatinib

  imatinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• indapamide

  mifepristone, indapamide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• indinavir

  indinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone will increase the level or effect of indinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• irinotecan

  mifepristone will increase the level or effect of irinotecan by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• irinotecan liposomal

  mifepristone will increase the level or effect of irinotecan liposomal by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• isotretinoin

  mifepristone will increase the level or effect of isotretinoin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• isradipine

  mifepristone, isradipine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor closely for toxicities if coadministration necessary, (eg, frequent monitoring of peripheral blood counts between cycles of ixabepilone); consider dose reduction of ixabepilone in some patients

• istradefylline

  mifepristone will increase the level or effect of istradefylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed istradefylline 20 mg/day if coadministered with strong CYP3A4 inhibitors.
  
  istradefylline will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.

• itraconazole

  itraconazole, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors. Monitor for increased concentrations/toxic effects, during and 2 weeks following treatment with mifepristone.

• ivacaftor

  mifepristone will increase the level or effect of ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce ivacaftor dose if coadministered with strong CYP3A4 inhibitors. See specific ivacaftor-containing product for precise dosage modification.

• ketamine

  mifepristone will increase the level or effect of ketamine by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• lacosamide

  mifepristone will increase the level or effect of lacosamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lapatinib

  mifepristone will increase the level or effect of lapatinib by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if available
  
  mifepristone will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, decrease dose of lapatinib to 500 mg PO once daily; use lowest effective dose of mifepristone to reduce risk of QT prolongation; monitor ECGs for QT prolongation and monitor electrolytes; correct electrolyte abnormalities prior to treatment; if mifepristone discontinued, increase lapatinib to indicated dose after a period of approximately 1 week

• lenvatinib

  mifepristone and lenvatinib both increase QTc interval. Use Caution/Monitor. Lenvatinib prescribing information recommends monitoring ECG closely when coadministered with QT prolonging drugs.

• letermovir

  mifepristone increases levels of letermovir by decreasing metabolism. Use Caution/Monitor. Coadminstration of letermovir, an OATP1B1/3 substrate, with OATP1B1/3 inhibitors may increase letermovir plasma concentrations.
  
  letermovir increases effects of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levamlodipine

  mifepristone will increase the level or effect of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with moderate and strong CYP3A inhibitors results in increased systemic exposure to amlodipine and may require dose reduction. Monitor for symptoms of hypotension and edema when amlodipine is coadministered with CYP3A inhibitors to determine the need for dose adjustment.

• levofloxacin

  mifepristone, levofloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• levonorgestrel intrauterine

  mifepristone decreases effects of levonorgestrel intrauterine by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• levonorgestrel oral

  mifepristone decreases effects of levonorgestrel oral by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• linagliptin

  mifepristone will increase the level or effect of linagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lofexidine

  mifepristone and lofexidine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended.

• lomitapide

  mifepristone increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lomitapide dose should not exceed 30 mg/day.

• lopinavir

  lopinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone, lopinavir. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, obtain baseline ECG to assess initial QT interval and determine frequency of subsequent ECG monitoring, avoid any non-essential QT prolonging drugs; correct electrolyte abnormalities; monitor patients for lopinavir-related adverse effects (eg, nausea, vomiting, diarrhea, hypokalemia, fast irregular heartbeat, pancreatic or hepatic dysfunction)

• losartan

  mifepristone will increase the level or effect of losartan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lumacaftor/ivacaftor

  mifepristone will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, monitor efficacy and adjust dosages as necessary

• lumefantrine

  mifepristone, lumefantrine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lurasidone

  mifepristone, lurasidone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• maprotiline

  mifepristone, maprotiline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• maraviroc

  mifepristone will increase the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mefloquine

  mifepristone, mefloquine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• mestranol

  mifepristone decreases effects of mestranol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• metaxalone

  mifepristone will increase the level or effect of metaxalone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• methadone

  mifepristone will increase the level or effect of methadone by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if available

• mirtazapine

  mifepristone will increase the level or effect of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mitotane

  mitotane decreases levels of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• modafinil

  mifepristone will increase the level or effect of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mometasone, intranasal

  mifepristone will increase the level or effect of mometasone, intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• moxifloxacin

  mifepristone, moxifloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• nafcillin

  nafcillin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• naldemedine

  mifepristone will increase the level or effect of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nefazodone

  nefazodone will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone will increase the level or effect of nefazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• nelfinavir

  nelfinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nevirapine

  nevirapine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nifedipine

  mifepristone will increase the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nilotinib

  mifepristone, nilotinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• nimodipine

  mifepristone will increase the level or effect of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• norelgestromin

  mifepristone decreases effects of norelgestromin by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norethindrone

  mifepristone decreases effects of norethindrone by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norethindrone acetate

  mifepristone decreases effects of norethindrone acetate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norgestimate

  mifepristone decreases effects of norgestimate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• nortriptyline

  mifepristone, nortriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• octreotide

  mifepristone, octreotide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ofloxacin

  mifepristone, ofloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• olanzapine

  mifepristone, olanzapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• oliceridine

  mifepristone will increase the level or effect of oliceridine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use is necessary, may require less frequent oliceridine dosing. Closely monitor for respiratory depression and sedation and titrate subsequent doses accordingly. If inhibitor is discontinued, consider increase oliceridine dosage until stable drug effects are achieved. Monitor for signs of opioid withdrawal.

• ondansetron

  mifepristone, ondansetron. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• osilodrostat

  mifepristone will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce dose of osilodrostat, a CYP3A4 substrate, by half when coadministered with a strong CYP3A4 inhibitor.
  
  osilodrostat and mifepristone both increase QTc interval. Use Caution/Monitor.

• osimertinib

  osimertinib and mifepristone both increase QTc interval. Use Caution/Monitor. Conduct periodic monitoring with ECGs and electrolytes in patients taking drugs known to prolong the QTc interval.

• ospemifene

  mifepristone will increase the level or effect of ospemifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• oxaliplatin

  oxaliplatin will increase the level or effect of mifepristone by Other (see comment). Use Caution/Monitor. Monitor for ECG changes if therapy is initiated in patients with drugs known to prolong QT interval.

• oxcarbazepine

  oxcarbazepine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• oxycodone

  mifepristone will increase the level or effect of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ozanimod

  ozanimod and mifepristone both increase QTc interval. Modify Therapy/Monitor Closely. The potential additive effects on heart rate, treatment with ozanimod should generally not be initiated in patients who are concurrently treated with QT prolonging drugs with known arrhythmogenic properties.

• paclitaxel

  mifepristone will increase the level or effect of paclitaxel by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• paclitaxel protein bound

  mifepristone will increase the level or effect of paclitaxel protein bound by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• paliperidone

  mifepristone, paliperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• paricalcitol

  mifepristone will increase the level or effect of paricalcitol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• pasireotide

  mifepristone and pasireotide both increase QTc interval. Modify Therapy/Monitor Closely.

• pazopanib

  mifepristone will increase the level or effect of pazopanib by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if available

• pentamidine

  mifepristone, pentamidine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• pentobarbital

  pentobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• perphenazine

  mifepristone, perphenazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• phenobarbital

  phenobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• phenytoin

  phenytoin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• pioglitazone

  mifepristone will increase the level or effect of pioglitazone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• pitavastatin

  mifepristone increases toxicity of pitavastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• polatuzumab vedotin

  mifepristone will increase the level or effect of polatuzumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Polatuzumab undergoes catabolism to small peptides, amino acids, monomethyl auristatin E (MMAE), and unconjugated MMAE-related catabolites. MMAE is a CYP3A4 substrate. Coadministration of polatuzumab vedotin with a strong CYP3A4 inhibitor may increase unconjugated MMAE AUC, which may increase polatuzumab vedotin toxicities.

• posaconazole

  posaconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if available

• pravastatin

  mifepristone increases toxicity of pravastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• praziquantel

  mifepristone will increase the level or effect of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• primidone

  primidone will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• procainamide

  mifepristone, procainamide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• progesterone intravaginal gel

  mifepristone will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• progesterone micronized

  mifepristone will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• progesterone, natural

  mifepristone will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• promethazine

  mifepristone will increase the level or effect of promethazine by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• propafenone

  mifepristone, propafenone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• propofol

  mifepristone will increase the level or effect of propofol by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• protriptyline

  mifepristone, protriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• quazepam

  mifepristone will increase the level or effect of quazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• quetiapine

  mifepristone, quetiapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• quinine

  mifepristone, quinine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ranolazine

  mifepristone, ranolazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• repaglinide

  mifepristone will increase the level or effect of repaglinide by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor
  
  mifepristone will increase the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ribociclib

  ribociclib, mifepristone. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• rifabutin

  rifabutin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• rifampin

  rifampin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• rifapentine

  rifapentine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• ripretinib

  mifepristone will increase the level or effect of ripretinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with a strong CYP3A inhibitor will increase systemic exposure to ripretinib and its active metabolite (DP-5439), which may increase risk of adverse reactions.

• risperidone

  mifepristone, risperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ritonavir

  ritonavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone, ritonavir. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• rivaroxaban

  mifepristone will increase the level or effect of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. These drugs may be coadministered with caution when mifepristone given chronically for conditions, including Cushing's syndrome; increased serum concentrations of rivaroxaban possible

• romidepsin

  mifepristone, romidepsin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• rosiglitazone

  mifepristone will increase the level or effect of rosiglitazone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• rucaparib

  rucaparib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• sacubitril/valsartan

  mifepristone will increase the level or effect of sacubitril/valsartan by Other (see comment). Use Caution/Monitor. The results from an in vitro study with human liver tissue indicate that valsartan is a substrate of the hepatic uptake transporter OATP1B1; coadministration with OATP1B1 inhibitors may increase valsartan systemic exposure

• salmeterol

  mifepristone will increase the level or effect of salmeterol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• saquinavir

  saquinavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if available

• saxagliptin

  mifepristone will increase the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. When coadministered, the initial dose of saxagliptin should be limited to 2.5 mg/day

• segesterone/ethinyl estradiol

  mifepristone decreases effects of segesterone/ethinyl estradiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• selegiline

  mifepristone will increase the level or effect of selegiline by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9/2B6; use smallest recommended dose for substrates and monitor

• selexipag

  mifepristone will increase the level or effect of selexipag by decreasing metabolism. Modify Therapy/Monitor Closely. Reduce selexipag dose to once daily if coadministered with moderate CYP2C8 inhibitors.

• selpercatinib

  selpercatinib increases toxicity of mifepristone by QTc interval. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of selpercatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary and original dose selpercatinib was 120 mg twice daily, reduce dose to 40 mg PO twice daily; reduce dose to 80 mg PO twice daily if original dose was 160 mg twice daily; monitor ECGs for QT prolongation more frequently; if mifepristone is discontinued, resume original selpercatinib dose after 3 to 5 elimination half-lives of mifepristone

• sertraline

  mifepristone, sertraline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• sitagliptin

  mifepristone will increase the level or effect of sitagliptin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• sofosbuvir/velpatasvir

  mifepristone will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• solifenacin

  mifepristone, solifenacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• sorafenib

  mifepristone, sorafenib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• sotalol

  mifepristone, sotalol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• St John's Wort

  St John's Wort will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• stiripentol

  stiripentol, mifepristone. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.

• sufentanil

  mifepristone will increase the level or effect of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If coadministration necessary, consider reduced dose of sufentanil injection with frequent monitoring for respiratory depression and sedation if concurrent use of mifepristone is necessary; if mifepristone is discontinued, consider increasing sufentanil injection dose until stable drug effects are achieved and monitor for evidence of opioid withdrawal

• sufentanil SL

  mifepristone will increase the level or effect of sufentanil SL by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of sufentanil SL with any CYP3A4 inhibitor may increase sufentanil plasma concentration, and, thereby increase or prolonged adverse effects, including potentially fatal respiratory depression.

• sunitinib

  mifepristone, sunitinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, monitor patients for QT prolongation and consider reducing dose of sunitinib, based on individual safety and tolerability, in 12.5 mg decrements to minimum of 37.5 mg (GIST and RCC) or 25 mg (pNET) daily

• tadalafil

  mifepristone will increase the level or effect of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tamoxifen

  mifepristone decreases effects of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. ketoconazole, tamoxifen. affecting hepatic/intestinal enzyme CYP3A4 metabolism. CYP3A4 inhibition decreases metabolism of tamoxifen to N-desmethyl tamoxifen (active metabolite with similar biologic activity).

• tamsulosin

  mifepristone will increase the level or effect of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tasimelteon

  mifepristone will increase the level or effect of tasimelteon by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tazemetostat

  tazemetostat will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tecovirimat

  tecovirimat will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• telavancin

  mifepristone, telavancin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• temsirolimus

  mifepristone will increase the level or effect of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, consider reducing dose of temsirolimus to 12.5 mg/ week; allow a period of approximately 1 week after discontinuing mifepristone before increasing temsirolimus to original dose

• terbinafine

  mifepristone will increase the level or effect of terbinafine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• thiothixene

  mifepristone, thiothixene. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ticagrelor

  mifepristone will increase the level or effect of ticagrelor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tinidazole

  mifepristone will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tipranavir

  mifepristone will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• tofacitinib

  mifepristone will increase the level or effect of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, reduce dose of tofacitinib if chronic mifepristone therapy used; reduce to 5 mg twice daily in patients receiving 10 mg twice daily; reduce to 5 mg once daily in patients receiving 5 mg twice daily; change to 11 mg XR once daily in patients receiving 22 mg once daily of XR formulation; change to immediate-release formulation at dose of 5 mg once daily in patients receiving 11 mg XR once daily

• toremifene

  mifepristone, toremifene. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• tramadol

  mifepristone will increase the level or effect of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• treprostinil

  mifepristone will increase the level or effect of treprostinil by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• tretinoin

  mifepristone will increase the level or effect of tretinoin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• tretinoin topical

  mifepristone will increase the level or effect of tretinoin topical by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• triclabendazole

  triclabendazole and mifepristone both increase QTc interval. Use Caution/Monitor.

• trimipramine

  mifepristone, trimipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• umeclidinium bromide/vilanterol inhaled

  mifepristone will increase the level or effect of umeclidinium bromide/vilanterol inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• upadacitinib

  mifepristone will increase the level or effect of upadacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution if upadacitinib is coadministered with strong CYP3A4 inhibitors.

• valsartan

  mifepristone will increase the level or effect of valsartan by Other (see comment). Use Caution/Monitor. The results from an in vitro study with human liver tissue indicate that valsartan is a substrate of the hepatic uptake transporter OATP1B1; coadministration with OATP1B1 inhibitors may increase valsartan systemic exposure

• vandetanib

  mifepristone, vandetanib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• vardenafil

  mifepristone, vardenafil. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• velpatasvir

  mifepristone will increase the level or effect of velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vemurafenib

  mifepristone, vemurafenib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• venlafaxine

  mifepristone will increase the level or effect of venlafaxine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• verapamil

  verapamil will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vilazodone

  mifepristone will increase the level or effect of vilazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If intolerable adverse effects occur when coadministered with moderate CYP3A4 inhibitors, reduce vilazodone to 20 mg/day

• vinblastine

  mifepristone will increase the level or effect of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vincristine

  mifepristone will increase the level or effect of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vincristine liposomal

  mifepristone will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vinorelbine

  mifepristone will increase the level or effect of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vorapaxar

  mifepristone will increase the level or effect of vorapaxar by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• voriconazole

  voriconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if available

• vorinostat

  mifepristone, vorinostat. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• vortioxetine

  mifepristone will increase the level or effect of vortioxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• zanubrutinib

  mifepristone will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib dose when coadministered with a strong CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib. See zanubrutinib Dosage Modifications for precise recommendation.

• ziprasidone

  mifepristone, ziprasidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• zolpidem

  mifepristone will increase the level or effect of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

Minor (2)

• chloroquine

  chloroquine increases toxicity of mifepristone by QTc interval. Minor/Significance Unknown.

• ruxolitinib

  mifepristone will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• abametapir

  Serious - Use Alternative (1)abametapir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.

• abemaciclib

  Monitor Closely (1)mifepristone will increase the level or effect of abemaciclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Patients who have had dose reduction to 100 mg twice daily due to adverse reactions, may further reduce dose of abemaciclib to 50 mg PO twice daily; discontinue abemaciclib for patients unable to tolerate 50 mg twice daily; if mifepristone is discontinued, increase dose of abemaciclib to original dose after 3 to 5 half-lives of mifepristone

• acalabrutinib

  Monitor Closely (1)mifepristone will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If mifepristone use necessary, limit dose of acalabrutinib to 100 mg once daily and monitor closely for drug-related toxicity and need for further adjustment or interruption of acalbrutinib therapy

• ado-trastuzumab emtansine

  Monitor Closely (1)mifepristone will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, closely monitor patients for ado-trastuzumab emtansine-related adverse reactions

• afatinib

  Serious - Use Alternative (1)mifepristone increases levels of afatinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Reduce afatinib daily dose by 10 mg if not tolerated when coadministered with P-gp inhibitors.

• alfentanil

  Serious - Use Alternative (1)mifepristone will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• alfuzosin

  Contraindicated (1)mifepristone will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.Serious - Use Alternative (1)mifepristone and alfuzosin both increase QTc interval. Avoid or Use Alternate Drug. Use alternatives if available

• alprazolam

  Monitor Closely (1)mifepristone will increase the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amiodarone

  Monitor Closely (1)mifepristone will increase the level or effect of amiodarone by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• amitriptyline

  Monitor Closely (1)mifepristone, amitriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• amlodipine

  Monitor Closely (1)mifepristone will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amobarbital

  Monitor Closely (1)amobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amoxapine

  Monitor Closely (1)mifepristone, amoxapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• antithrombin alfa

  Contraindicated (1)mifepristone, antithrombin alfa. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• antithrombin III

  Contraindicated (1)mifepristone, antithrombin III. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• apalutamide

  Serious - Use Alternative (2)mifepristone will increase the level or effect of apalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. No initial dose adjustment
  
  apalutamide will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.

• apixaban

  Contraindicated (1)mifepristone increases toxicity of apixaban by anticoagulation. Contraindicated.Monitor Closely (1)mifepristone will increase the level or effect of apixaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce apixaban dose by 50% when mifepristone used for treatment of Cushing's disease or other hormonal conditions; if patients are already receiving 2.5 mg twice daily, avoid coadministration

• apomorphine

  Monitor Closely (1)mifepristone, apomorphine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• aprepitant

  Monitor Closely (1)aprepitant will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• arformoterol

  Monitor Closely (1)mifepristone, arformoterol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• argatroban

  Contraindicated (1)mifepristone, argatroban. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• aripiprazole

  Monitor Closely (1)mifepristone will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If these drugs must be used together, follow manufacturer recommendations

• armodafinil

  Serious - Use Alternative (1)mifepristone will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• arsenic trioxide

  Monitor Closely (1)mifepristone, arsenic trioxide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• artemether

  Monitor Closely (1)mifepristone, artemether. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• artemether/lumefantrine

  Monitor Closely (1)mifepristone, artemether/lumefantrine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• asenapine

  Monitor Closely (1)mifepristone, asenapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• aspirin

  Contraindicated (1)aspirin, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).Serious - Use Alternative (1)aspirin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• aspirin rectal

  Contraindicated (1)aspirin rectal, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).

• aspirin/citric acid/sodium bicarbonate

  Contraindicated (1)aspirin/citric acid/sodium bicarbonate, mifepristone. Other (see comment). Contraindicated. Comment: Aspirin induced antiplatelet activity may induce excessive bleeding after an abortion w/mifepristone (RU 486).

• atazanavir

  Monitor Closely (2)atazanavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors. Potential for increased toxicity
  
  mifepristone will increase the level or effect of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• atorvastatin

  Monitor Closely (1)mifepristone will increase the level or effect of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose of atorvastatin should not exceed 40 mg/day, when administered with a strong CYP3A4 inhibitor Serious - Use Alternative (1)mifepristone increases toxicity of atorvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• avanafil

  Serious - Use Alternative (1)mifepristone will increase the level or effect of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• avapritinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of avapritinib with strong CYP3A4 inhibitors.

• avatrombopag

  Monitor Closely (1)mifepristone will increase the level or effect of avatrombopag by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. When treating ITP, reduce starting dose of avatrombopag to 20 mg PO 3 times weekly when used concomitantly with mifepristone; in patients starting mifepristone while receiving avatrombopag, monitor platelet counts and adjust avatrombopag dose as necessary; coadministration of avatrombopag with a moderate or strong dual CYP2C9/3A4 inhibitor requires a decreased avatrombopag starting dose. Refer to manufacturer recommendations.

• axitinib

  Monitor Closely (1)mifepristone increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• azithromycin

  Monitor Closely (1)mifepristone, azithromycin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• bedaquiline

  Monitor Closely (2)mifepristone and bedaquiline both increase QTc interval. Modify Therapy/Monitor Closely. ECG should be monitored closely
  
  mifepristone will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid concurrent use of bedaquiline for more than 14 days unless benefits justify risks

• bemiparin

  Contraindicated (1)mifepristone, bemiparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• benzhydrocodone/acetaminophen

  Serious - Use Alternative (1)mifepristone will increase the level or effect of benzhydrocodone/acetaminophen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration with strong CYP3A4 inhibitors may increase hydrocodone (benzhydrocodone is prodrug of hydrocodone) plasma concentrations and can result in potentially fatal respiratory depression.

• bivalirudin

  Contraindicated (1)mifepristone, bivalirudin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• boceprevir

  Monitor Closely (1)boceprevir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors

• bortezomib

  Monitor Closely (1)mifepristone will increase the level or effect of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• bosentan

  Monitor Closely (1)bosentan will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturerSerious - Use Alternative (1)mifepristone will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• brentuximab vedotin

  Monitor Closely (1)mifepristone will increase the level or effect of brentuximab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• brexpiprazole

  Monitor Closely (1)mifepristone will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• brigatinib

  Monitor Closely (1)mifepristone will increase the level or effect of brigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, reduce dose of brigatinib by approximately 50% without breaking tablets (ie, from 180 mg to 90 mg; from 90 mg to 60 mg); after discontinuation of mifepristone, resume brigatinib dose that was tolerated prior to initiation of mifepristone

• bromocriptine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• budesonide

  Contraindicated (1)mifepristone, budesonide. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.Serious - Use Alternative (1)mifepristone will increase the level or effect of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• buprenorphine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• buprenorphine transdermal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• bupropion

  Monitor Closely (1)mifepristone will increase the level or effect of bupropion by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• buspirone

  Monitor Closely (1)mifepristone will increase the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If buspirone needs to be administered concurrently, a low dose of buspirone (ie, 2.5 mg PO twice daily) recommended initially; base subsequent dosage adjustments on clinical response

• cabozantinib

  Monitor Closely (1)mifepristone will increase the level or effect of cabozantinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, reduce dose of cabozantinib; for patients taking cabozantinib tablets, reduce dose by 20 mg (eg, 60 mg/day to 40 mg/day; 40 mg/day to 20 mg/day); for patients taking cabozantinib capsules, reduce dose by 40 mg (eg, 140 mg/day to 100 mg/day or 100 mg/day to 60 mg/day); resume cabozantinib dose that was used prior to initiating treatment with mifepristone 2 to 3 days after discontinuation of mifepristone

• calcifediol

  Monitor Closely (1)mifepristone will increase the level or effect of calcifediol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• calcitriol

  Serious - Use Alternative (1)mifepristone will increase the level or effect of calcitriol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cannabidiol

  Monitor Closely (1)mifepristone will increase the level or effect of cannabidiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Consider reducing the cannabidiol dose when coadministered with a strong CYP3A4 inhibitor.

• capmatinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of capmatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• carbamazepine

  Monitor Closely (1)carbamazepine, mifepristone. Other (see comment). Use Caution/Monitor. Comment: Carbamazepine may decrease mifepristone levels via CYP3A4 induction; additionally, mifepristone may increase carbamazepine levels by inhibiting CYP2C8/2C9.Serious - Use Alternative (2)mifepristone will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  carbamazepine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cariprazine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of cariprazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong mifepristone initiated, reduce current dosage of cariprazine by half; if patient is already taking the CYP3A4 inhibitor and initiating cariprazine, follow manufacturer?s recommendation

• cenobamate

  Monitor Closely (1)cenobamate will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• ceritinib

  Monitor Closely (2)mifepristone increases levels of ceritinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  mifepristone, ceritinib. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. May increase QT prolongation.

• chloramphenicol

  Serious - Use Alternative (1)chloramphenicol will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• chloroquine

  Monitor Closely (1)mifepristone will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Minor (1)chloroquine increases toxicity of mifepristone by QTc interval. Minor/Significance Unknown.

• chlorpromazine

  Monitor Closely (1)mifepristone, chlorpromazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• cholic acid

  Monitor Closely (1)mifepristone increases toxicity of cholic acid by decreasing elimination. Modify Therapy/Monitor Closely. Avoid concomitant use of inhibitors of the bile salt efflux pump (BSEP). May exacerbate accumulation of conjugated bile salts in the liver and result in clinical symptoms. If concomitant use is necessary, monitor serum transaminases and bilirubin.

• ciclesonide inhaled

  Monitor Closely (1)mifepristone will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cilostazol

  Serious - Use Alternative (1)mifepristone will increase the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ciprofloxacin

  Monitor Closely (1)ciprofloxacin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Use alternatives if available.

• cisapride

  Contraindicated (1)mifepristone, cisapride. QTc interval. Contraindicated.Serious - Use Alternative (1)mifepristone will increase the level or effect of cisapride by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• citalopram

  Monitor Closely (2)mifepristone, citalopram. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concurrent therapy considered essential, ECG monitoring recommended

• clarithromycin

  Monitor Closely (1)clarithromycin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• clobetasone

  Contraindicated (1)mifepristone, clobetasone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• clomipramine

  Monitor Closely (1)mifepristone, clomipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• clonazepam

  Monitor Closely (1)mifepristone will increase the level or effect of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• clozapine

  Monitor Closely (1)mifepristone, clozapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• cobicistat

  Monitor Closely (1)cobicistat will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, administer 300 mg mifepristone initially; not to exceed 600 mg; if cobicistat initiated in patient receiving 600 mg mifepristone, reduce mirepristone dose to 300 mg; if cobicistat initiated in patient receiving 900-1200 mg mifepristone, reduce mifepristone dose to 600 mg; if initiated in patient receiving 300 mg mifepristone, no change in dose necessary

• cobimetinib

  Monitor Closely (1)mifepristone will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If short-term coadministration (14 days or less) of mifepristone necessary, reduce dose of cobimetinib to 20 mg once daily for patients normally taking 60 mg daily; after discontinuation of mifepristone, resume cobimetinib at previous dose; use alternative to mifepristone in patients who are already taking a reduced dose of cobimetinib (20-40 mg daily)

• colchicine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of colchicine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid use of colchicine with strong CYP3A4 inhibitors. If coadministration is necessary, decrease colchicine dose or frequency as recommended in prescribing information. Use of any colchicine product in conjunction with strong CYP3A4 inhibitors is contraindicated in patients with renal or hepatic impairment.

• conivaptan

  Contraindicated (1)mifepristone will increase the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.Monitor Closely (1)conivaptan will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors

• conjugated estrogens

  Monitor Closely (1)mifepristone will increase the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• copanlisib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of copanlisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cortisone

  Contraindicated (1)mifepristone, cortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• crizotinib

  Monitor Closely (1)mifepristone, crizotinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Increase in crizotinib levels may result in QT prolongation

• cyclophosphamide

  Monitor Closely (2)mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cyclosporine

  Contraindicated (1)mifepristone increases levels of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• dabigatran

  Contraindicated (1)mifepristone, dabigatran. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• dabrafenib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of dabrafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• daclatasvir

  Monitor Closely (1)mifepristone will increase the level or effect of daclatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dalteparin

  Contraindicated (1)mifepristone, dalteparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• dapsone

  Monitor Closely (1)mifepristone will increase the level or effect of dapsone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• darifenacin

  Monitor Closely (1)mifepristone will increase the level or effect of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. In adults receiving mifepristone chronically for treatment of hormonal conditions, daily dose of darifenacin should not exceed 7.5 mg/day PO

• darunavir

  Monitor Closely (2)darunavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• dasatinib

  Monitor Closely (1)mifepristone, dasatinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration necessary, concomitant use of mifepristone not recommended in patients receiving dasatinib 40-60 mg daily; consider a dasatinib dose reduction to 40 mg PO daily if original dose was 140 mg daily, 20 mg PO daily if original dose was 100 mg daily, or 20 mg PO daily if original dose was 70 mg daily; If dasatinib is not tolerated after dose reduction, consider alternative therapies; if mifepristone stopped, wait approximately 1 week before increasing dasatinib dose

• deflazacort

  Contraindicated (1)mifepristone, deflazacort. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.Serious - Use Alternative (1)mifepristone will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Decrease dose by one third if combination cannot be avoided

• degarelix

  Monitor Closely (1)mifepristone, degarelix. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• delavirdine

  Monitor Closely (1)mifepristone will increase the level or effect of delavirdine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• desipramine

  Monitor Closely (1)mifepristone, desipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• desogestrel

  Monitor Closely (1)mifepristone decreases effects of desogestrel by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• deutetrabenazine

  Monitor Closely (1)mifepristone and deutetrabenazine both increase QTc interval. Modify Therapy/Monitor Closely. For patients requiring deutetrabenazine doses >24 mg/day and are taking other drugs known to prolong QTc, assess the QTc interval before and after increasing the dose of deutetrabenazine or other medications known to prolong QTc.

• dexamethasone

  Contraindicated (1)mifepristone, dexamethasone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.Serious - Use Alternative (1)mifepristone will increase the level or effect of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• diazepam

  Serious - Use Alternative (1)mifepristone will increase the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• diazepam intranasal

  Monitor Closely (1)mifepristone will increase the level or effect of diazepam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong or moderate CYP3A4 inhibitors may decrease rate of diazepam elimination, thereby increasing adverse reactions to diazepam.

• dichlorphenamide

  Monitor Closely (1)dichlorphenamide and mifepristone both decrease serum potassium. Use Caution/Monitor.

• diclofenac topical

  Monitor Closely (1)mifepristone will increase the level or effect of diclofenac topical by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• dienogest/estradiol valerate

  Monitor Closely (2)mifepristone decreases effects of dienogest/estradiol valerate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.
  
  mifepristone will increase the level or effect of dienogest/estradiol valerate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for potential adverse effects such as nausea, irregular uterine bleeding, breast tenderness and headache.

• dihydroergotamine

  Contraindicated (1)mifepristone increases levels of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• dihydroergotamine intranasal

  Contraindicated (1)mifepristone increases levels of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• diltiazem

  Monitor Closely (2)diltiazem will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of mifepristone, CYP3A4 inhibitor with diltiazem, CYP3A4 substrate may increase plasma concentrations of diltiazem. Discontinuation or dose reduction of diltiazem may be necessary with mifepristone coadministration.
  
  mifepristone will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• disopyramide

  Monitor Closely (1)mifepristone, disopyramide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• docetaxel

  Monitor Closely (1)mifepristone will increase the level or effect of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Closely monitor for docetaxel-related adverse reactions and consider 50% dose reduction of docetaxel if concomitant use of docetaxel with chronic mifepristone necessary; clinical significance of this interaction with short-term use of mifepristone for termination of pregnancy unknown

• dofetilide

  Monitor Closely (1)mifepristone, dofetilide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)dofetilide increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug.

• dolasetron

  Monitor Closely (1)mifepristone, dolasetron. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• doravirine

  Monitor Closely (1)mifepristone will increase the level or effect of doravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of doravirine and CYP3A4 inhibitors may increase plasma concentrations and toxicities of doravirine.

• doxepin cream

  Monitor Closely (1)mifepristone will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• doxorubicin

  Monitor Closely (1)mifepristone will increase the level or effect of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• doxorubicin liposomal

  Monitor Closely (1)mifepristone will increase the level or effect of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dronabinol

  Monitor Closely (1)mifepristone will increase the level or effect of dronabinol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dronedarone

  Contraindicated (1)mifepristone, dronedarone. QTc interval. Contraindicated.Serious - Use Alternative (1)mifepristone will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• droperidol

  Monitor Closely (1)mifepristone, droperidol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• drospirenone

  Monitor Closely (1)mifepristone decreases effects of drospirenone by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• duvelisib

  Monitor Closely (2)mifepristone will increase the level or effect of duvelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with a strong CYP3A4 inhibitor increases duvelisib AUC, which may increase the risk of duvelisib toxicities. Reduce duvelisib dose to 15 mg BID when coadministered with a strong CYP3A4 inhibitor.
  
  duvelisib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with duvelisib increases AUC of a sensitive CYP3A4 substrate which may increase the risk of toxicities of these drugs. Consider reducing the dose of the sensitive CYP3A4 substrate and monitor for signs of toxicities of the coadministered sensitive CYP3A substrate.

• efavirenz

  Monitor Closely (1)efavirenz, mifepristone. Other (see comment). Use Caution/Monitor. Comment: Efavirenz shown in vitro to induce CYP3A4 and CYP2B6, but in vitro has been shown to inhibit CYP3A4 and therefore may affect mifepristone levels/effect; mifepristone inhibits CYP2B6, therefore increasing exposure of efavirenz.Serious - Use Alternative (2)mifepristone will increase the level or effect of efavirenz by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  efavirenz will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• elagolix

  Monitor Closely (2)mifepristone will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of elagolix 200 mg BID with strong CYP3A inhibitors for >1 month is not recommended. Limit elagolix dose to 150 mg qDay and CYP3A inhibitor duration of use to 6 months if coadministered.
  
  elagolix decreases levels of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

• elbasvir/grazoprevir

  Monitor Closely (1)mifepristone will increase the level or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eletriptan

  Contraindicated (1)mifepristone will increase the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• eliglustat

  Serious - Use Alternative (1)mifepristone will increase the level or effect of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eluxadoline

  Serious - Use Alternative (1)mifepristone increases levels of eluxadoline by decreasing metabolism. Avoid or Use Alternate Drug. Decrease eluxadoline dose to 75 mg PO BID if coadministered with OATP1B1 inhibitors. .

• elvitegravir

  Serious - Use Alternative (1)mifepristone will increase the level or effect of elvitegravir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  Serious - Use Alternative (1)mifepristone will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• encorafenib

  Monitor Closely (1)encorafenib, mifepristone. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.Serious - Use Alternative (2)mifepristone will increase the level or effect of encorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concomitant use of a strong CYP3A4 inhibitor is unavoidable, reduce encorafenib dose to one-third of the dose (eg, reduce from 450 mg/day to 150 mg/day). After discontinuing the inhibitor for 3-5 elimination half-lives, resume previous encorafenib dose.
  
  encorafenib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Encorafenib is associated with dose-dependent QTc interval prolongation. Avoid with drugs known to prolong QT interval.

• enfortumab vedotin

  Monitor Closely (1)mifepristone increases toxicity of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Enfortumab vedotin is an antibody-drug conjugate that releases monomethylauristatin E (MMAE) via proteolytic cleavage. MMAE is primarily metabolized by CYP3A4 in vitro. Coadministration with strong CYP3A4 inhibitors may increase free MMAE exposure, which may increase the incidence or severity of toxicities.

• enoxaparin

  Contraindicated (1)mifepristone, enoxaparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• entrectinib

  Serious - Use Alternative (2)mifepristone and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of strong CYP3A4 inhibitors with entrectinib, a CYP3A4 substrate. If coadministration unavoidable, reduce entrectinib dose to 100 mg/day for patients aged 12 y or older with BSA >1.50m2. Resume previous entrectinib dose after discontinuing strong CYP3A inhibitor for 3-5 elimination half-lives.

• enzalutamide

  Serious - Use Alternative (2)mifepristone will increase the level or effect of enzalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  enzalutamide will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• eplerenone

  Contraindicated (1)mifepristone will increase the level or effect of eplerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• erdafitinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of erdafitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid coadministration with strong CYP3A4 inhibitors, monitor closely for adverse reactions and consider decreasing dose accordingly. If strong CYP3A4 inhibitor is discontinued, consider increasing erdafitinib dose in the absence of any drug-related toxicities.

• ergoloid mesylates

  Contraindicated (1)mifepristone will increase the level or effect of ergoloid mesylates by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ergonovine

  Contraindicated (1)mifepristone will increase the level or effect of ergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ergotamine

  Contraindicated (1)mifepristone increases levels of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• erlotinib

  Monitor Closely (1)mifepristone will increase the level or effect of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce dose of erlotinib by 50 mg decrements If concomitant use necessary and severe reactions occur; clinical significance of this interaction with short-term use of mifepristone for termination of pregnancy unknown

• erythromycin base

  Monitor Closely (2)erythromycin base will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin base. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  Monitor Closely (2)erythromycin ethylsuccinate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin ethylsuccinate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  Monitor Closely (2)erythromycin lactobionate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin lactobionate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin stearate

  Monitor Closely (2)erythromycin stearate will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, erythromycin stearate. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• escitalopram

  Monitor Closely (3)mifepristone will increase the level or effect of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  escitalopram increases toxicity of mifepristone by QTc interval. Use Caution/Monitor.
  
  mifepristone, escitalopram. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• eslicarbazepine acetate

  Monitor Closely (1)eslicarbazepine acetate will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• estradiol

  Monitor Closely (1)mifepristone will increase the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estrogens conjugated synthetic

  Monitor Closely (1)mifepristone will increase the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estrogens esterified

  Monitor Closely (1)mifepristone will increase the level or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estropipate

  Monitor Closely (1)mifepristone will increase the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eszopiclone

  Serious - Use Alternative (1)mifepristone will increase the level or effect of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ethinylestradiol

  Monitor Closely (1)mifepristone decreases effects of ethinylestradiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.Serious - Use Alternative (1)mifepristone will increase the level or effect of ethinylestradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ethosuximide

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• etoposide

  Monitor Closely (1)mifepristone will increase the level or effect of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• etravirine

  Monitor Closely (2)etravirine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer
  
  mifepristone will increase the level or effect of etravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• etynodiol

  Monitor Closely (1)mifepristone decreases effects of etynodiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• everolimus

  Serious - Use Alternative (1)mifepristone will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• exemestane

  Monitor Closely (1)mifepristone will increase the level or effect of exemestane by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ezogabine

  Monitor Closely (1)mifepristone, ezogabine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• famotidine

  Monitor Closely (2)famotidine, mifepristone. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.
  
  mifepristone, famotidine. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.

• fedratinib

  Monitor Closely (1)fedratinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.Serious - Use Alternative (1)mifepristone will increase the level or effect of fedratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid fedratinib coadministration with strong CYP3A4 inhibitors, decrease fedratinib dose to 200 mg/day. If CYP3A4 inhibitor discontinued, increase fedratinib dose to 300 mg/day for 2 weeks, and then 400 mg/day thereafter as tolerated.

• felbamate

  Serious - Use Alternative (1)mifepristone will increase the level or effect of felbamate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• felodipine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fentanyl

  Monitor Closely (1)mifepristone will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fentanyl intranasal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fentanyl transdermal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• fentanyl transmucosal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for respiratory depression and sedation at frequent intervals if coadministration of CYP3A4 inhibitors with fentanyl is necessary, and consider fentanyl dose adjustments until stable drug effects achieved

• ferrous fumarate

  Monitor Closely (1)mifepristone decreases effects of ferrous fumarate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• fexinidazole

  Serious - Use Alternative (2)mifepristone will decrease the level or effect of fexinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unable to avoid coadministration, monitor fexinidazole for decreased efficacy owing to decreased plasma concentrations of active M1 and M2 metabolites.
  
  fexinidazole and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels or prolong QT interval.

• finerenone

  Contraindicated (1)mifepristone will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• flecainide

  Monitor Closely (1)mifepristone, flecainide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• flibanserin

  Monitor Closely (1)mifepristone will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased flibanserin adverse effects may occur if coadministered with multiple weak CYP3A4 inhibitors.

• fluconazole

  Monitor Closely (2)fluconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, fluconazole. Either increases toxicity of the other by QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fludrocortisone

  Contraindicated (1)mifepristone, fludrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• flunisolide inhaled

  Monitor Closely (1)mifepristone will increase the level or effect of flunisolide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fluoxetine

  Monitor Closely (1)mifepristone, fluoxetine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fluphenazine

  Monitor Closely (1)mifepristone, fluphenazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• flurazepam

  Serious - Use Alternative (1)mifepristone will increase the level or effect of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• fluticasone furoate inhaled

  Monitor Closely (1)mifepristone will increase the level or effect of fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong CYP3A4 inhibitors may increase fluticasone systemic exposure

• fluticasone inhaled

  Monitor Closely (1)mifepristone will increase the level or effect of fluticasone inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong CYP3A4 inhibitors may increase fluticasone systemic exposure

• fluvastatin

  Serious - Use Alternative (1)mifepristone increases toxicity of fluvastatin by Other (see comment). Avoid or Use Alternate Drug. Comment: Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; OATP1B1 inhibitors may increase risk of myopathy.

• fondaparinux

  Contraindicated (1)mifepristone, fondaparinux. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• formoterol

  Monitor Closely (1)mifepristone, formoterol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fosamprenavir

  Monitor Closely (1)fosamprenavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.Serious - Use Alternative (1)mifepristone will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• foscarnet

  Monitor Closely (1)mifepristone, foscarnet. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• fosphenytoin

  Monitor Closely (1)fosphenytoin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• fostamatinib

  Monitor Closely (1)mifepristone will increase the level or effect of fostamatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Strong CYP3A4 inhibitors may increase exposure to R406 (fostamatinib major active metabolite). Monitor for toxicities that may require fostamatinib dose reduction.

• fostemsavir

  Monitor Closely (1)mifepristone and fostemsavir both increase QTc interval. Use Caution/Monitor. QTc prolongation reported with higher than recommended doses of fostemsavir.

• gefitinib

  Monitor Closely (1)mifepristone will increase the level or effect of gefitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• gemifloxacin

  Monitor Closely (1)mifepristone, gemifloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• gemtuzumab

  Monitor Closely (1)mifepristone and gemtuzumab both increase QTc interval. Use Caution/Monitor.

• gilteritinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of gilteritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider alternatives to any strong CYP3A4 inhibitor when coadministered with gilteritinib. If such a combination cannot be avoided, closely monitor for gilteritinib-related adverse effects. Interrupt and reduce gilteritinib dosage in patients with serious or life-threatening toxicity.

• glasdegib

  Serious - Use Alternative (2)mifepristone will increase the level or effect of glasdegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider alternate therapies that are not strong CYP3A inhibitors or monitor for increased risk of adverse effects, including QTc interval prolongation.
  
  mifepristone and glasdegib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, monitor for increased risk of QTc interval prolongation.

• glecaprevir/pibrentasvir

  Monitor Closely (1)mifepristone will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• goserelin

  Contraindicated (1)goserelin increases toxicity of mifepristone by QTc interval. Contraindicated. Increases risk of torsades de pointes.

• grapefruit

  Monitor Closely (1)grapefruit will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• guanfacine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• haloperidol

  Monitor Closely (1)mifepristone, haloperidol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• heparin

  Contraindicated (1)mifepristone, heparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• histrelin

  Serious - Use Alternative (1)histrelin increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Increases risk of torsades de pointes.

• hydrocodone

  Monitor Closely (1)mifepristone will increase the level or effect of hydrocodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• hydrocortisone

  Contraindicated (1)mifepristone, hydrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• hydroxychloroquine sulfate

  Serious - Use Alternative (1)hydroxychloroquine sulfate and mifepristone both increase QTc interval. Avoid or Use Alternate Drug.

• hydroxyprogesterone caproate

  Serious - Use Alternative (1)mifepristone will increase the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ibrutinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ibuprofen/famotidine

  Monitor Closely (2)ibuprofen/famotidine, mifepristone. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.
  
  mifepristone, ibuprofen/famotidine. Either increases toxicity of the other by QTc interval. Use Caution/Monitor.

• ibutilide

  Monitor Closely (1)mifepristone, ibutilide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• idelalisib

  Monitor Closely (1)mifepristone will increase the level or effect of idelalisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)idelalisib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

• ifosfamide

  Monitor Closely (2)mifepristone will decrease the level or effect of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of CYP3A4 inhibitors may decrease the metabolism of ifosfamide to its active alkylating metabolites and decrease the efficacy of ifosfamide.
  
  mifepristone will decrease the level or effect of ifosfamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor. Coadministration of ifosfamide with CYP2B6 inhibitors may decrease metabolism of ifosfamide to its metabolite, potentially reducing ifosfamide therapeutic effects.

• iloperidone

  Monitor Closely (1)mifepristone, iloperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• imatinib

  Monitor Closely (1)imatinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• indapamide

  Monitor Closely (1)mifepristone, indapamide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• indinavir

  Monitor Closely (2)indinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone will increase the level or effect of indinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• infigratinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of infigratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• inotuzumab

  Serious - Use Alternative (1)inotuzumab and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. If unable to avoid concomitant use, obtain ECGs and electrolytes before and after initiation of any drug known to prolong QTc, and periodically monitor as clinically indicated during treatment.

• irinotecan

  Monitor Closely (1)mifepristone will increase the level or effect of irinotecan by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration and for at least 1 week prior to initiating therapy unless no therapeutic alternatives

• irinotecan liposomal

  Monitor Closely (1)mifepristone will increase the level or effect of irinotecan liposomal by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. UGT1A1 inhibitors decrease irinotecan metabolism

• isosorbide dinitrate

  Serious - Use Alternative (1)mifepristone will increase the level or effect of isosorbide dinitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• isosorbide mononitrate

  Serious - Use Alternative (1)mifepristone will increase the level or effect of isosorbide mononitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• isotretinoin

  Monitor Closely (1)mifepristone will increase the level or effect of isotretinoin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• isradipine

  Monitor Closely (2)mifepristone will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor closely for toxicities if coadministration necessary, (eg, frequent monitoring of peripheral blood counts between cycles of ixabepilone); consider dose reduction of ixabepilone in some patients
  
  mifepristone, isradipine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• istradefylline

  Monitor Closely (2)istradefylline will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.
  
  mifepristone will increase the level or effect of istradefylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed istradefylline 20 mg/day if coadministered with strong CYP3A4 inhibitors.

• itraconazole

  Monitor Closely (1)itraconazole, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors. Monitor for increased concentrations/toxic effects, during and 2 weeks following treatment with mifepristone.Serious - Use Alternative (1)mifepristone will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ivacaftor

  Monitor Closely (1)mifepristone will increase the level or effect of ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce ivacaftor dose if coadministered with strong CYP3A4 inhibitors. See specific ivacaftor-containing product for precise dosage modification.

• ivosidenib

  Serious - Use Alternative (3)mifepristone will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of strong CYP3A4 inhibitors with ivosidenib or replace with alternate therapies. If coadministration of a strong CYP3A4 inhibitor is unavoidable, reduce ivosidenib dose to 250 mg qDay. If the strong inhibitor is discontinued, increase ivosidenib dose (after at least 5 half-lives of the strong CYP3A4 inhibitor) to the recommended dose of 500 mg qDay. Monitor for increased risk of QTc interval prolongation.
  
  ivosidenib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of QTc prolonging drugs with ivosidenib or replace with alternate therapies. If coadministration of a QTc prolonging drug is unavoidable, monitor for increased risk of QTc interval prolongation.
  
  ivosidenib will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternative therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• ixabepilone

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients receiving CYP3A4 inhibitors during treatment with ixabepilone for acute toxicities (eg, frequent monitoring of peripheral blood counts between cycles of ixabepilone); consider, a dose reduction of ixabepilone in some patients

• ketamine

  Monitor Closely (1)mifepristone will increase the level or effect of ketamine by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of ketamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ketoconazole

  Serious - Use Alternative (1)ketoconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• lacosamide

  Monitor Closely (1)mifepristone will increase the level or effect of lacosamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lapatinib

  Monitor Closely (2)mifepristone will increase the level or effect of lapatinib by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if available
  
  mifepristone will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, decrease dose of lapatinib to 500 mg PO once daily; use lowest effective dose of mifepristone to reduce risk of QT prolongation; monitor ECGs for QT prolongation and monitor electrolytes; correct electrolyte abnormalities prior to treatment; if mifepristone discontinued, increase lapatinib to indicated dose after a period of approximately 1 week

• larotrectinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of larotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration of larotrectinib with strong CYP3A4 inhibitors is unavoidable, reduce larotrectinib dose by 50%. Resume prior larotrectinib dose once CYP3A4 inhibitor discontinued for 3-5 half-lives.

• lefamulin

  Contraindicated (1)lefamulin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lefamulin is contraindicated with CYP3A substrates know to prolong the QT interval.Serious - Use Alternative (1)mifepristone will increase the level or effect of lefamulin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of lefamulin with strong CYP3A inhibitors.

• lemborexant

  Serious - Use Alternative (1)mifepristone will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of lemborexant with moderate or strong CYP3A inhibitors.

• lenvatinib

  Monitor Closely (1)mifepristone and lenvatinib both increase QTc interval. Use Caution/Monitor. Lenvatinib prescribing information recommends monitoring ECG closely when coadministered with QT prolonging drugs.

• lepirudin

  Contraindicated (1)mifepristone, lepirudin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• letermovir

  Monitor Closely (2)mifepristone increases levels of letermovir by decreasing metabolism. Use Caution/Monitor. Coadminstration of letermovir, an OATP1B1/3 substrate, with OATP1B1/3 inhibitors may increase letermovir plasma concentrations.
  
  letermovir increases effects of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• leuprolide

  Contraindicated (1)leuprolide increases toxicity of mifepristone by QTc interval. Contraindicated. Increases risk of torsades de pointes.

• levamlodipine

  Monitor Closely (1)mifepristone will increase the level or effect of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with moderate and strong CYP3A inhibitors results in increased systemic exposure to amlodipine and may require dose reduction. Monitor for symptoms of hypotension and edema when amlodipine is coadministered with CYP3A inhibitors to determine the need for dose adjustment.

• levofloxacin

  Monitor Closely (1)mifepristone, levofloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• levomilnacipran

  Serious - Use Alternative (1)mifepristone will increase the level or effect of levomilnacipran by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• levonorgestrel intrauterine

  Monitor Closely (1)mifepristone decreases effects of levonorgestrel intrauterine by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.Serious - Use Alternative (1)mifepristone will increase the level or effect of levonorgestrel intrauterine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• levonorgestrel oral

  Monitor Closely (1)mifepristone decreases effects of levonorgestrel oral by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.Serious - Use Alternative (1)mifepristone will increase the level or effect of levonorgestrel oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• linagliptin

  Monitor Closely (1)mifepristone will increase the level or effect of linagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lofexidine

  Monitor Closely (1)mifepristone and lofexidine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended.

• lomitapide

  Monitor Closely (1)mifepristone increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lomitapide dose should not exceed 30 mg/day.

• lonafarnib

  Contraindicated (1)mifepristone will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lonafarnib is a sensitive CYP3A4 substrate. Coadministration with strong or moderate CYP3A4 inhibitors is contraindicated.

• lopinavir

  Monitor Closely (3)lopinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone, lopinavir. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, obtain baseline ECG to assess initial QT interval and determine frequency of subsequent ECG monitoring, avoid any non-essential QT prolonging drugs; correct electrolyte abnormalities; monitor patients for lopinavir-related adverse effects (eg, nausea, vomiting, diarrhea, hypokalemia, fast irregular heartbeat, pancreatic or hepatic dysfunction)

• lorlatinib

  Serious - Use Alternative (2)lorlatinib will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of lorlatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministering lorlatinib with strong CYP3A inhibitors. If unavoidable, reduce lorlatinib dose by 25 mg/day. If strong CYP3A inhibitor discontinued, increase to previous lorlatinib (dose after 3 plasma half-lives of strong CYP3A inhibitor). See monograph for further details.

• losartan

  Monitor Closely (1)mifepristone will increase the level or effect of losartan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lovastatin

  Contraindicated (1)mifepristone increases levels of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated due to increased risk of rhabdomyolysis.

• lumacaftor/ivacaftor

  Monitor Closely (1)mifepristone will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, monitor efficacy and adjust dosages as necessary

• lumefantrine

  Monitor Closely (2)mifepristone will increase the level or effect of lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, lumefantrine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• lurasidone

  Monitor Closely (1)mifepristone, lurasidone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lurbinectedin

  Serious - Use Alternative (2)lurbinectedin will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone will increase the level or effect of lurbinectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• macimorelin

  Serious - Use Alternative (2)mifepristone will increase the level or effect of macimorelin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  macimorelin and mifepristone both increase QTc interval. Avoid or Use Alternate Drug. Macimorelin causes an increase of ~11 msec in the corrected QT interval. Avoid coadministration with drugs that prolong QT interval, which could increase risk for developing torsade de pointes-type ventricular tachycardia. Allow sufficient washout time of drugs that are known to prolong the QT interval before administering macimorelin.

• maprotiline

  Monitor Closely (1)mifepristone, maprotiline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• maraviroc

  Monitor Closely (1)mifepristone will increase the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• medroxyprogesterone

  Serious - Use Alternative (1)mifepristone will increase the level or effect of medroxyprogesterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• mefloquine

  Monitor Closely (1)mifepristone, mefloquine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (2)mefloquine increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Mefloquine may enhance the QTc prolonging effect of high risk QTc prolonging agents.
  
  mifepristone will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• mestranol

  Monitor Closely (1)mifepristone decreases effects of mestranol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.Serious - Use Alternative (1)mifepristone will increase the level or effect of mestranol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• metaxalone

  Monitor Closely (1)mifepristone will increase the level or effect of metaxalone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• methadone

  Monitor Closely (1)mifepristone will increase the level or effect of methadone by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• methylergonovine

  Contraindicated (1)mifepristone will increase the level or effect of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• methylprednisolone

  Contraindicated (1)mifepristone, methylprednisolone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.Serious - Use Alternative (1)mifepristone will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• midazolam intranasal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of strong CYP3A4 inhibitors with midazolam intranasal causes higher midazolam systemic exposure, which may prolong sedation.

• midostaurin

  Serious - Use Alternative (1)mifepristone will increase the level or effect of midostaurin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• mirtazapine

  Monitor Closely (1)mifepristone will increase the level or effect of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mitotane

  Monitor Closely (1)mitotane decreases levels of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• modafinil

  Monitor Closely (1)mifepristone will increase the level or effect of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mometasone topical

  Contraindicated (1)mifepristone, mometasone topical. Either increases toxicity of the other by Other (see comment). Contraindicated. Comment: Mifepristone is contraindicated in patients on long-term corticosteriod treatment due to increase risk of adrenal insufficiency.

• mometasone, intranasal

  Monitor Closely (1)mifepristone will increase the level or effect of mometasone, intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• moxifloxacin

  Monitor Closely (1)mifepristone, moxifloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• nafcillin

  Monitor Closely (1)nafcillin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• naldemedine

  Monitor Closely (1)mifepristone will increase the level or effect of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• naloxegol

  Contraindicated (1)mifepristone will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• nefazodone

  Monitor Closely (2)nefazodone will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone will increase the level or effect of nefazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• nelfinavir

  Monitor Closely (2)nelfinavir, mifepristone. Either increases levels of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors.
  
  mifepristone will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nevirapine

  Monitor Closely (1)nevirapine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nicardipine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nifedipine

  Monitor Closely (1)mifepristone will increase the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nilotinib

  Monitor Closely (1)mifepristone, nilotinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nimodipine

  Monitor Closely (1)mifepristone will increase the level or effect of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nisoldipine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• norelgestromin

  Monitor Closely (1)mifepristone decreases effects of norelgestromin by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norethindrone

  Contraindicated (1)mifepristone will increase the level or effect of norethindrone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.Monitor Closely (1)mifepristone decreases effects of norethindrone by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norethindrone acetate

  Monitor Closely (1)mifepristone decreases effects of norethindrone acetate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norgestimate

  Monitor Closely (1)mifepristone decreases effects of norgestimate by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• norgestrel

  Serious - Use Alternative (1)mifepristone decreases effects of norgestrel by pharmacodynamic antagonism. Contraindicated. Backup contraceptive method recommended.

• nortriptyline

  Monitor Closely (1)mifepristone, nortriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• octreotide

  Monitor Closely (1)mifepristone, octreotide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ofloxacin

  Monitor Closely (1)mifepristone, ofloxacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• olanzapine

  Monitor Closely (1)mifepristone, olanzapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• olaparib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concomitant use necessary, reduce dose of olaparib to 100 mg twice daily; original dose may be resumed 3 to 5 elimination half-lives after mifepristone is discontinued

• oliceridine

  Monitor Closely (1)mifepristone will increase the level or effect of oliceridine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use is necessary, may require less frequent oliceridine dosing. Closely monitor for respiratory depression and sedation and titrate subsequent doses accordingly. If inhibitor is discontinued, consider increase oliceridine dosage until stable drug effects are achieved. Monitor for signs of opioid withdrawal.

• ombitasvir/paritaprevir/ritonavir

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ombitasvir/paritaprevir/ritonavir & dasabuvir

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ondansetron

  Monitor Closely (1)mifepristone, ondansetron. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of ondansetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• osilodrostat

  Monitor Closely (2)osilodrostat and mifepristone both increase QTc interval. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce dose of osilodrostat, a CYP3A4 substrate, by half when coadministered with a strong CYP3A4 inhibitor.

• osimertinib

  Monitor Closely (1)osimertinib and mifepristone both increase QTc interval. Use Caution/Monitor. Conduct periodic monitoring with ECGs and electrolytes in patients taking drugs known to prolong the QTc interval.Serious - Use Alternative (1)mifepristone will increase the level or effect of osimertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ospemifene

  Monitor Closely (1)mifepristone will increase the level or effect of ospemifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• oxaliplatin

  Monitor Closely (1)oxaliplatin will increase the level or effect of mifepristone by Other (see comment). Use Caution/Monitor. Monitor for ECG changes if therapy is initiated in patients with drugs known to prolong QT interval.

• oxcarbazepine

  Monitor Closely (1)oxcarbazepine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• oxycodone

  Monitor Closely (1)mifepristone will increase the level or effect of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ozanimod

  Monitor Closely (1)ozanimod and mifepristone both increase QTc interval. Modify Therapy/Monitor Closely. The potential additive effects on heart rate, treatment with ozanimod should generally not be initiated in patients who are concurrently treated with QT prolonging drugs with known arrhythmogenic properties.

• paclitaxel

  Monitor Closely (1)mifepristone will increase the level or effect of paclitaxel by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitorSerious - Use Alternative (1)mifepristone will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• paclitaxel protein bound

  Monitor Closely (1)mifepristone will increase the level or effect of paclitaxel protein bound by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitorSerious - Use Alternative (1)mifepristone will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• palbociclib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of palbociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• paliperidone

  Monitor Closely (1)mifepristone, paliperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• panobinostat

  Serious - Use Alternative (2)mifepristone will increase the level or effect of panobinostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone and panobinostat both increase QTc interval. Avoid or Use Alternate Drug. Panobinostat is known to significantly prolong QT interval. Panobinostat prescribing information states use with drugs known to prolong QTc is not recommended.

• paricalcitol

  Monitor Closely (1)mifepristone will increase the level or effect of paricalcitol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• pasireotide

  Monitor Closely (1)mifepristone and pasireotide both increase QTc interval. Modify Therapy/Monitor Closely.

• pazopanib

  Monitor Closely (1)mifepristone will increase the level or effect of pazopanib by Other (see comment). Modify Therapy/Monitor Closely. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor; combination may increase QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pemigatinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of pemigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pemigatinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pemigatinib dose.

• pentamidine

  Monitor Closely (1)mifepristone, pentamidine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• pentobarbital

  Monitor Closely (1)pentobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• perphenazine

  Monitor Closely (1)mifepristone, perphenazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• pexidartinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of pexidartinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pexidartinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pexidartinib dose.

• phenindione

  Contraindicated (1)mifepristone, phenindione. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• phenobarbital

  Monitor Closely (1)phenobarbital will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• phenytoin

  Monitor Closely (1)phenytoin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• pimavanserin

  Serious - Use Alternative (2)mifepristone will increase the level or effect of pimavanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone and pimavanserin both increase QTc interval. Avoid or Use Alternate Drug. Coadministration may increase the risk of QT prolongation and cardiac arrhythmia.

• pimozide

  Contraindicated (1)mifepristone increases levels of pimozide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index; combination may prolong QT interval .

• pioglitazone

  Monitor Closely (1)mifepristone will increase the level or effect of pioglitazone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• pitavastatin

  Monitor Closely (1)mifepristone increases toxicity of pitavastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• pitolisant

  Serious - Use Alternative (2)mifepristone will increase the level or effect of pitolisant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone and pitolisant both increase QTc interval. Avoid or Use Alternate Drug.

• polatuzumab vedotin

  Monitor Closely (1)mifepristone will increase the level or effect of polatuzumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Polatuzumab undergoes catabolism to small peptides, amino acids, monomethyl auristatin E (MMAE), and unconjugated MMAE-related catabolites. MMAE is a CYP3A4 substrate. Coadministration of polatuzumab vedotin with a strong CYP3A4 inhibitor may increase unconjugated MMAE AUC, which may increase polatuzumab vedotin toxicities.

• pomalidomide

  Serious - Use Alternative (1)mifepristone increases levels of pomalidomide by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

• ponatinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ponatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• posaconazole

  Monitor Closely (1)posaconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if available

• pralsetinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of pralsetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pravastatin

  Monitor Closely (1)mifepristone increases toxicity of pravastatin by Other (see comment). Use Caution/Monitor. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• praziquantel

  Monitor Closely (1)mifepristone will increase the level or effect of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• prednisolone

  Contraindicated (1)mifepristone, prednisolone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• prednisone

  Contraindicated (1)mifepristone, prednisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• primaquine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of primaquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• primidone

  Monitor Closely (1)primidone will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• procainamide

  Monitor Closely (1)mifepristone, procainamide. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• progesterone intravaginal gel

  Monitor Closely (1)mifepristone will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• progesterone micronized

  Monitor Closely (1)mifepristone will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• progesterone, natural

  Monitor Closely (1)mifepristone will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• promethazine

  Monitor Closely (1)mifepristone will increase the level or effect of promethazine by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• propafenone

  Monitor Closely (1)mifepristone, propafenone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• propofol

  Monitor Closely (1)mifepristone will increase the level or effect of propofol by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• protamine

  Contraindicated (1)mifepristone, protamine. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• protriptyline

  Monitor Closely (1)mifepristone, protriptyline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• quazepam

  Monitor Closely (1)mifepristone will increase the level or effect of quazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• quetiapine

  Monitor Closely (1)mifepristone, quetiapine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• quinidine

  Contraindicated (1)mifepristone increases levels of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index; combination may prolong QT interval .

• quinine

  Monitor Closely (1)mifepristone, quinine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rabeprazole

  Serious - Use Alternative (1)mifepristone will increase the level or effect of rabeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ranolazine

  Monitor Closely (1)mifepristone, ranolazine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• regorafenib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of regorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• repaglinide

  Monitor Closely (2)mifepristone will increase the level or effect of repaglinide by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor
  
  mifepristone will increase the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ribociclib

  Monitor Closely (1)ribociclib, mifepristone. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (2)mifepristone will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and mifepristone both increase QTc interval. Avoid or Use Alternate Drug.

• rifabutin

  Monitor Closely (1)rifabutin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturerSerious - Use Alternative (1)mifepristone will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifampin

  Monitor Closely (1)rifampin will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• rifapentine

  Monitor Closely (1)rifapentine will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• rimegepant

  Serious - Use Alternative (1)mifepristone will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• riociguat

  Serious - Use Alternative (1)mifepristone will increase the level or effect of riociguat by decreasing metabolism. Avoid or Use Alternate Drug. Coadministration of riociguat (substrate of CYP isoenzymes 1A1, 2C8, 3A, 2J2) with strong CYP inhibitors may require a decreased initial dose of 0.5 mg PO TID; monitor for signs of hypotension and reduce dose if needed

• ripretinib

  Monitor Closely (1)mifepristone will increase the level or effect of ripretinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with a strong CYP3A inhibitor will increase systemic exposure to ripretinib and its active metabolite (DP-5439), which may increase risk of adverse reactions.

• risperidone

  Monitor Closely (1)mifepristone, risperidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• ritonavir

  Monitor Closely (3)ritonavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors
  
  mifepristone, ritonavir. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• rivaroxaban

  Contraindicated (1)mifepristone increases toxicity of rivaroxaban by anticoagulation. Contraindicated.Monitor Closely (1)mifepristone will increase the level or effect of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. These drugs may be coadministered with caution when mifepristone given chronically for conditions, including Cushing's syndrome; increased serum concentrations of rivaroxaban possible

• romidepsin

  Monitor Closely (1)mifepristone, romidepsin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rosiglitazone

  Monitor Closely (1)mifepristone will increase the level or effect of rosiglitazone by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• rosuvastatin

  Serious - Use Alternative (1)mifepristone increases toxicity of rosuvastatin by Other (see comment). Avoid or Use Alternate Drug.

• rucaparib

  Monitor Closely (1)rucaparib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• ruxolitinib

  Minor (1)mifepristone will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sacubitril/valsartan

  Monitor Closely (1)mifepristone will increase the level or effect of sacubitril/valsartan by Other (see comment). Use Caution/Monitor. The results from an in vitro study with human liver tissue indicate that valsartan is a substrate of the hepatic uptake transporter OATP1B1; coadministration with OATP1B1 inhibitors may increase valsartan systemic exposure

• salmeterol

  Monitor Closely (1)mifepristone will increase the level or effect of salmeterol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• saquinavir

  Monitor Closely (1)saquinavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• saxagliptin

  Monitor Closely (1)mifepristone will increase the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. When coadministered, the initial dose of saxagliptin should be limited to 2.5 mg/day

• segesterone/ethinyl estradiol

  Monitor Closely (1)mifepristone decreases effects of segesterone/ethinyl estradiol by pharmacodynamic antagonism. Use Caution/Monitor. Backup contraceptive method recommended.

• selegiline

  Monitor Closely (1)mifepristone will increase the level or effect of selegiline by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9/2B6; use smallest recommended dose for substrates and monitor

• selexipag

  Monitor Closely (1)mifepristone will increase the level or effect of selexipag by decreasing metabolism. Modify Therapy/Monitor Closely. Reduce selexipag dose to once daily if coadministered with moderate CYP2C8 inhibitors.

• selpercatinib

  Monitor Closely (2)selpercatinib increases toxicity of mifepristone by QTc interval. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of selpercatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary and original dose selpercatinib was 120 mg twice daily, reduce dose to 40 mg PO twice daily; reduce dose to 80 mg PO twice daily if original dose was 160 mg twice daily; monitor ECGs for QT prolongation more frequently; if mifepristone is discontinued, resume original selpercatinib dose after 3 to 5 elimination half-lives of mifepristone

• selumetinib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of selumetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors cannot be avoided, reduce selumetinib dosage (refer to selumetinib monograph for further information). After discontinuation of the strong or moderate CYP3A4 inhibitor for 3 elimination half-lives, resume selumetinib dose that was taken before initiating the inhibitor.

• sertraline

  Monitor Closely (1)mifepristone, sertraline. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• sildenafil

  Serious - Use Alternative (1)mifepristone will increase the level or effect of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• simvastatin

  Contraindicated (2)mifepristone increases levels of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated due to increased risk of rhabdomyolysis.
  
  mifepristone increases toxicity of simvastatin by Other (see comment). Contraindicated. Comment: OATP1B1 inhibitors may increase risk of myopathy.

• siponimod

  Serious - Use Alternative (1)mifepristone will increase the level or effect of siponimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of siponimod with a moderate or strong CYP3A4 inhibitor PLUS a moderate or strong CYP2C9 inhibitor is not recommended.

• sirolimus

  Contraindicated (1)mifepristone increases levels of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• sitagliptin

  Monitor Closely (1)mifepristone will increase the level or effect of sitagliptin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• sofosbuvir/velpatasvir

  Monitor Closely (1)mifepristone will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• solifenacin

  Monitor Closely (2)mifepristone will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, solifenacin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• sonidegib

  Serious - Use Alternative (1)mifepristone will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• sorafenib

  Monitor Closely (2)mifepristone, sorafenib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• sotalol

  Monitor Closely (1)mifepristone, sotalol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• St John's Wort

  Monitor Closely (1)St John's Wort will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers have not been studied, coadministration not recommended by manufacturer

• stiripentol

  Monitor Closely (1)stiripentol, mifepristone. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.Serious - Use Alternative (1)mifepristone will increase the level or effect of stiripentol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• sufentanil

  Monitor Closely (1)mifepristone will increase the level or effect of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If coadministration necessary, consider reduced dose of sufentanil injection with frequent monitoring for respiratory depression and sedation if concurrent use of mifepristone is necessary; if mifepristone is discontinued, consider increasing sufentanil injection dose until stable drug effects are achieved and monitor for evidence of opioid withdrawal

• sufentanil SL

  Monitor Closely (1)mifepristone will increase the level or effect of sufentanil SL by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of sufentanil SL with any CYP3A4 inhibitor may increase sufentanil plasma concentration, and, thereby increase or prolonged adverse effects, including potentially fatal respiratory depression.

• sunitinib

  Monitor Closely (2)mifepristone, sunitinib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.
  
  mifepristone will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use necessary, monitor patients for QT prolongation and consider reducing dose of sunitinib, based on individual safety and tolerability, in 12.5 mg decrements to minimum of 37.5 mg (GIST and RCC) or 25 mg (pNET) daily

• suvorexant

  Serious - Use Alternative (1)mifepristone will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tacrolimus

  Contraindicated (1)mifepristone increases levels of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Contraindicated with CYP3A substrates that have a narrow therapeutic index .

• tadalafil

  Monitor Closely (1)mifepristone will increase the level or effect of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tamoxifen

  Monitor Closely (1)mifepristone decreases effects of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. ketoconazole, tamoxifen. affecting hepatic/intestinal enzyme CYP3A4 metabolism. CYP3A4 inhibition decreases metabolism of tamoxifen to N-desmethyl tamoxifen (active metabolite with similar biologic activity).

• tamsulosin

  Monitor Closely (1)mifepristone will increase the level or effect of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tasimelteon

  Monitor Closely (1)mifepristone will increase the level or effect of tasimelteon by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tazemetostat

  Monitor Closely (1)tazemetostat will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone will increase the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of tazemetostat with strong CYP3A4 inhibitors.

• tecovirimat

  Monitor Closely (1)tecovirimat will decrease the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• telavancin

  Monitor Closely (1)mifepristone, telavancin. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• temsirolimus

  Monitor Closely (1)mifepristone will increase the level or effect of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, consider reducing dose of temsirolimus to 12.5 mg/ week; allow a period of approximately 1 week after discontinuing mifepristone before increasing temsirolimus to original dose

• teniposide

  Serious - Use Alternative (1)mifepristone will increase the level or effect of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• terbinafine

  Monitor Closely (1)mifepristone will increase the level or effect of terbinafine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tezacaftor

  Serious - Use Alternative (1)mifepristone will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• thioridazine

  Contraindicated (1)mifepristone, thioridazine. QTc interval. Contraindicated.

• thiothixene

  Monitor Closely (1)mifepristone, thiothixene. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• tiagabine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ticagrelor

  Monitor Closely (1)mifepristone will increase the level or effect of ticagrelor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tinidazole

  Monitor Closely (1)mifepristone will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tinzaparin

  Contraindicated (1)mifepristone, tinzaparin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• tipranavir

  Monitor Closely (1)mifepristone will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)tipranavir will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tofacitinib

  Monitor Closely (1)mifepristone will increase the level or effect of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration necessary, reduce dose of tofacitinib if chronic mifepristone therapy used; reduce to 5 mg twice daily in patients receiving 10 mg twice daily; reduce to 5 mg once daily in patients receiving 5 mg twice daily; change to 11 mg XR once daily in patients receiving 22 mg once daily of XR formulation; change to immediate-release formulation at dose of 5 mg once daily in patients receiving 11 mg XR once daily

• tolterodine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration necessary in chronic mifepristone therapy, reduce dose of tolterodine IR to 1 mg twice daily and tolterodine ER to 2 mg once daily; monitor for QT prolongation

• tolvaptan

  Serious - Use Alternative (1)mifepristone will increase the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• toremifene

  Monitor Closely (1)mifepristone, toremifene. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• trabectedin

  Serious - Use Alternative (1)mifepristone will increase the level or effect of trabectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• tramadol

  Monitor Closely (1)mifepristone will increase the level or effect of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• trazodone

  Serious - Use Alternative (1)mifepristone will increase the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• treprostinil

  Monitor Closely (1)mifepristone will increase the level or effect of treprostinil by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• tretinoin

  Monitor Closely (1)mifepristone will increase the level or effect of tretinoin by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• tretinoin topical

  Monitor Closely (1)mifepristone will increase the level or effect of tretinoin topical by Other (see comment). Use Caution/Monitor. Inhibits CYP2C8/2C9; use smallest recommended doses for substrates and monitor

• triamcinolone acetonide injectable suspension

  Contraindicated (1)mifepristone, triamcinolone acetonide injectable suspension. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• triazolam

  Contraindicated (1)mifepristone will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• triclabendazole

  Monitor Closely (1)triclabendazole and mifepristone both increase QTc interval. Use Caution/Monitor.

• trimipramine

  Monitor Closely (2)mifepristone will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone, trimipramine. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• triptorelin

  Serious - Use Alternative (1)triptorelin increases toxicity of mifepristone by QTc interval. Avoid or Use Alternate Drug. Increases risk of torsades de pointes.

• tucatinib

  Serious - Use Alternative (2)mifepristone will increase the level or effect of tucatinib by Other (see comment). Avoid or Use Alternate Drug. Coadministration of tucatinib (a CYP2C8 substrate) with a strong or moderate CYP2C8 inhibitors increases tucatinib plasma concentrations and risk of toxicities.
  
  tucatinib will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of tucatinib with CYP3A substrates, where minimal concentration changes may lead to serious or life-threatening toxicities. If unavoidable, reduce CYP3A substrate dose according to product labeling.

• ubrogepant

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ubrogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• ulipristal

  Serious - Use Alternative (1)mifepristone will increase the level or effect of ulipristal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• umeclidinium bromide/vilanterol inhaled

  Monitor Closely (1)mifepristone will increase the level or effect of umeclidinium bromide/vilanterol inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mifepristone increases toxicity of umeclidinium bromide/vilanterol inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.

• upadacitinib

  Monitor Closely (1)mifepristone will increase the level or effect of upadacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution if upadacitinib is coadministered with strong CYP3A4 inhibitors.

• valbenazine

  Serious - Use Alternative (1)mifepristone will increase the level or effect of valbenazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• valsartan

  Monitor Closely (1)mifepristone will increase the level or effect of valsartan by Other (see comment). Use Caution/Monitor. The results from an in vitro study with human liver tissue indicate that valsartan is a substrate of the hepatic uptake transporter OATP1B1; coadministration with OATP1B1 inhibitors may increase valsartan systemic exposure

• vandetanib

  Monitor Closely (1)mifepristone, vandetanib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of vandetanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vardenafil

  Monitor Closely (1)mifepristone, vardenafil. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• velpatasvir

  Monitor Closely (1)mifepristone will increase the level or effect of velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vemurafenib

  Monitor Closely (1)mifepristone, vemurafenib. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.Serious - Use Alternative (1)mifepristone will increase the level or effect of vemurafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• venetoclax

  Serious - Use Alternative (1)mifepristone will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• venlafaxine

  Monitor Closely (1)mifepristone will increase the level or effect of venlafaxine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• verapamil

  Monitor Closely (2)verapamil will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vilanterol/fluticasone furoate inhaled

  Serious - Use Alternative (2)mifepristone will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  mifepristone increases toxicity of vilanterol/fluticasone furoate inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.

• vilazodone

  Monitor Closely (1)mifepristone will increase the level or effect of vilazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If intolerable adverse effects occur when coadministered with moderate CYP3A4 inhibitors, reduce vilazodone to 20 mg/day

• vinblastine

  Monitor Closely (1)mifepristone will increase the level or effect of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vincristine

  Monitor Closely (1)mifepristone will increase the level or effect of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vincristine liposomal

  Monitor Closely (1)mifepristone will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• vinorelbine

  Monitor Closely (1)mifepristone will increase the level or effect of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• voclosporin

  Contraindicated (1)mifepristone will increase the level or effect of voclosporin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• vorapaxar

  Monitor Closely (1)mifepristone will increase the level or effect of vorapaxar by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• voriconazole

  Monitor Closely (1)voriconazole will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Do not exceed mifepristone 300 mg/day for Cushing syndrome when coadministered with strong CYP3A4 inhibitors; combination may also prolong QT interval. Use alternatives if availableSerious - Use Alternative (1)mifepristone will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vorinostat

  Monitor Closely (1)mifepristone, vorinostat. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• vortioxetine

  Monitor Closely (1)mifepristone will increase the level or effect of vortioxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• voxelotor

  Serious - Use Alternative (2)mifepristone will increase the level or effect of voxelotor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor is primarily metabolized by CYP3A4. Avoid coadministration with strong CYP3A4 inhibitors. If unable to avoid coadministration, reduce voxelotor dose (see Dosage Modifications).
  
  voxelotor will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

• warfarin

  Contraindicated (1)mifepristone, warfarin. Other (see comment). Contraindicated. Comment: Mifepristone may lead to excessive post abortion bleeding in pts. on anticoagulant therapy.

• zanubrutinib

  Monitor Closely (1)mifepristone will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib dose when coadministered with a strong CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib. See zanubrutinib Dosage Modifications for precise recommendation.

• ziprasidone

  Monitor Closely (1)mifepristone, ziprasidone. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.

• zolpidem

  Monitor Closely (1)mifepristone will increase the level or effect of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.