ribociclib/letrozole (Rx)

Breast Cancer

Indicated as initial endocrine-based therapy for the treatment of pre/perimenopausal, postmenopausal women, or men with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)­-negative advanced or metastatic breast cancer

Ribociclib (initial dose): 600 mg PO qDay for 21 consecutive days followed by 7 days off treatment resulting in a 28-day cycle

Letrozole: 2.5 mg PO qDay taken through the 28-day cycle

Treat men or pre/perimenopausal women with a luteinizing hormone-releasing hormone (LHRH) agonist (eg, goserelin, leuprolide) according to clinical practice standards

Dosage Modifications (ribociclib)

Recommended dose modifications for adverse effects

• Starting dose: 600 mg/day
• First dose reduction: 400 mg/day
• Second dose reduction: 200 mg/day
• If further dose reduction below 200 mg/day is required, discontinue treatment

Neutropenia

• Grade 1-2 (ANC 1000/mm³ to
• Grade 3 (ANC 500 to <1000/mm³): Interrupt dose until recovery to Grade ≤2; resume at the same dose level; if toxicity recurs at Grade 3, interrupt dose until recovery, then resume at the next lower dose level
• Grade 3 febrile neutropenia (Grade 3 ANC with fever and/or concurrent infection): Dose interruption until recovery of neutropenia to Grade ≤2; resume at the next lower dose level
• Grade 4 (ANC <500/mm³): Dose interruption until recovery of neutropenia to Grade ≤2; resume at the next lower dose level

Hepatobiliary toxicity

• AST and/or ALT increased from baseline WITHOUT increased total bilirubin >2 x ULN

  • Grade 1 (>ULN to 3 x ULN): No dose adjustment required
  • Grade 2 (>3-5 x ULN), baseline at
  • Grade 2 (>3-5 x ULN), baseline at Grade 2: No dose interruption
  • Grade 3 (>5-20 x ULN): Interrupt dose until recovery to baseline (or less) before initiating treatment, then resume at next lower dose level; if Grade 3 recurs, discontinue
  • Grade 4 (>20 x ULN): Discontinue

• AST and/or ALT increased from baseline WITH increased total bilirubin, in the absence of cholestasis

  • Discontinue ribociclib if ALT and/or AST >3 x ULN plus total bilirubin >2 x ULN irrespective of baseline grade

QT prolongation

• ECGs with QTcF >480 msec

  • Interrupt treatment If QTcF resolves to <481 msec, resume treatment at same dose level
  • If QTcF ≥481 msec recurs, interrupt dose until QTcF resolves to <481 msec; then resume at next lower dose level

• ECGs with QTcF >500 msec

  • Interrupt KISQALI treatment if QTcF greater than 500 msec on at least 2 separate ECGs (within same visit)
  • If QTcF prolongation resolves to <481 msec, resume treatment at the next lower dose level
  • Permanently discontinue if QTcF interval prolongation is either >500 msec or >60 msec change from baseline AND associated with any of the following: torsades de pointes, polymorphic ventricular tachycardia, unexplained syncope, or signs/symptoms of serious arrhythmia

Interstitial lung disease/pneumonitis (ILD)

• Grade 1 (asymptomatic): No dose interruption or adjustment required; initiate appropriate medical therapy and monitor as clinically indicated
• Grade 2 (symptomatic): Dose interruption until recovery to Grade ≤1 then consider resuming at the next lower dose level; if Grade 2 recurs, discontinue treatment
• Grade 3 (severe symptomatic) or 4 (life-threatening): Discontinue treatment

Other toxicities

• Grade 1 or 2: No dose adjustment is required; initiate appropriate medical therapy and monitor as clinically indicated
• Grade 3: Interrupt dose until recovery to Grade ≤1, then resume at the same dose level; if Grade 3 recurs, resume at the next lower dose level
• Grade 4: Discontinue

Coadministration with strong CYP3A inhibitors

• Avoid use with strong CYP3A inhibitors and consider an alternative drug with less potential for CYP3A inhibition
• If a strong CYP3A inhibitor must be coadministered, reduce ribociclib dose to 400 mg/day
• If the strong CYP3A inhibitor is discontinued, change ribociclib dose (after at least 5 half-lives of the strong CYP3A inhibitor) to the dose used before initiating the strong CYP3A inhibitor

Hepatic impairment

• Ribociclib

  • Mild (Child-Pugh class A): No dose adjustment necessary
  • Moderate or severe (Child-Pugh classes B/C): Reduce starting dose to 400 mg/day

• Letrozole

  • Mild (Child-Pugh classes A/B): No dose adjustment necessary
  • Patients with cirrhosis and severe hepatic dysfunction: Reduce dose by 50% (ie, 2.5 mg every other day)
  • Noncirrhotic patients with elevated bilirubin levels have not been studied

Renal impairment

• Ribociclib

  • Mild-to-moderate (CrCl ≥30 mL/min): No dose adjustment necessary
  • Severe (CrCl 15-30 mL/min): Decrease starting dose to 200 mg/day; only studied healthy subjects and noncancer subjects with severe renal impairment

• Letrozole

  • Mild-to-moderate (CrCl ≥30 mL/min): No dose adjustment necessary
  • Severe (CrCl 10-30 mL/min): No dose adjustment necessary

Dosing Considerations (ribociclib)

Complete blood count (CBC)

• Perform CBC before initiating treatment
• Monitor CBC q2wk for the first 2 cycles, at the beginning of each subsequent 4 cycles, and as clinically indicated

Liver function tests (LFTs)

• Perform LFTs before initiating
• Monitor LFTs q2wk for the first 2 cycles, at the beginning of each subsequent 4 cycles, and as clinically indicated
• If Grade ≥2 abnormalities observed, more frequent monitoring is recommended

Electrocardiograms (ECGs) and electrolytes

• ECGs should be assessed prior to initiation of treatment
• Repeat ECGs at ~Day 14 of the first cycle and at the beginning of the second cycle, and as clinically indicated
• In case of (QTcF) prolongation at any given time during treatment, more frequent ECG monitoring is recommended
• Monitor serum electrolytes (including potassium, calcium, phosphorous and magnesium) before initiating, at the beginning of the first 6 cycles, and as clinically indicated; correct any abnormality before starting ribociclib

Safety and efficacy not established

Contraindicated (13)

• aprepitant

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

• budesonide

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

• conivaptan

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

• elvitegravir

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

• fluconazole

  ribociclib increases toxicity of fluconazole by QTc interval. Contraindicated.

• fosaprepitant

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

• lefamulin

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

• lonafarnib

  ribociclib 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.

• methadone

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

• naloxegol

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

• posaconazole

  ribociclib increases toxicity of posaconazole by QTc interval. Contraindicated.

• ranolazine

  ribociclib increases toxicity of ranolazine by QTc interval. Contraindicated.

• saquinavir

  ribociclib increases toxicity of saquinavir by QTc interval. Contraindicated.

Serious - Use Alternative (216)

• adagrasib

  adagrasib, ribociclib. Either increases effects of the other by QTc interval. Avoid or Use Alternate Drug. Each drug prolongs the QTc interval, which may increased the risk of Torsade de pointes, other serious arryhthmias, and sudden death. If coadministration unavoidable, more frequent monitoring is recommended for such patients.

• alfuzosin

  alfuzosin and ribociclib both increase QTc interval. Contraindicated.

• amiodarone

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

• amitriptyline

  ribociclib increases toxicity of amitriptyline by QTc interval. Avoid or Use Alternate Drug.

• anagrelide

  ribociclib and anagrelide both increase QTc interval. Avoid or Use Alternate Drug.

• apalutamide

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

• apomorphine

  ribociclib increases toxicity of apomorphine by QTc interval. Avoid or Use Alternate Drug.

• aripiprazole

  aripiprazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• arsenic trioxide

  ribociclib and arsenic trioxide both increase QTc interval. Avoid or Use Alternate Drug.

• artemether

  artemether and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• artemether/lumefantrine

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

• asenapine

  ribociclib and asenapine both increase QTc interval. Avoid or Use Alternate Drug.

• asenapine transdermal

  asenapine transdermal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• atazanavir

  atazanavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• atomoxetine

  atomoxetine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• avapritinib

  ribociclib 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 moderate CYP3A4 inhibitors. If unable to avoid, reduce avapritinib starting dose. See drug monograph Dosage Modifications.

• azithromycin

  ribociclib increases toxicity of azithromycin by QTc interval. Avoid or Use Alternate Drug.

• bedaquiline

  ribociclib will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of bedaquiline by QTc interval. Avoid or Use Alternate Drug.

• bosutinib

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

• brigatinib

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

• bromocriptine

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

• buprenorphine

  buprenorphine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine buccal

  buprenorphine buccal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine subdermal implant

  buprenorphine subdermal implant and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine transdermal

  buprenorphine transdermal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine, long-acting injection

  buprenorphine, long-acting injection and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• carbamazepine

  carbamazepine will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• ceritinib

  ribociclib, ceritinib. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. May increase QT prolongation.
  
  ceritinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ceritinib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• chloramphenicol

  chloramphenicol will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• chloroquine

  ribociclib and chloroquine both increase QTc interval. Avoid or Use Alternate Drug.

• chlorpromazine

  ribociclib increases toxicity of chlorpromazine by QTc interval. Avoid or Use Alternate Drug.

• chlorpropamide

  ribociclib and chlorpropamide both increase QTc interval. Avoid or Use Alternate Drug.

• ciprofloxacin

  ribociclib increases toxicity of ciprofloxacin by QTc interval. Avoid or Use Alternate Drug.

• citalopram

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

• clarithromycin

  clarithromycin will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib and clarithromycin both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• clofazimine

  ribociclib and clofazimine both increase QTc interval. Avoid or Use Alternate Drug.

• clomipramine

  ribociclib increases toxicity of clomipramine by QTc interval. Avoid or Use Alternate Drug.

• clozapine

  ribociclib will increase the level or effect of clozapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of clozapine by QTc interval. Avoid or Use Alternate Drug.

• cobicistat

  cobicistat will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of cobicistat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cobimetinib

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

• colchicine

  ribociclib 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

  conivaptan will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• crizotinib

  ribociclib 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
  
  ribociclib increases toxicity of crizotinib by QTc interval. Avoid or Use Alternate Drug.

• dabrafenib

  dabrafenib will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• darifenacin

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

• darunavir

  darunavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• dasatinib

  ribociclib increases toxicity of dasatinib by QTc interval. Avoid or Use Alternate Drug.

• deferiprone

  deferiprone, ribociclib. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid use of deferiprone with other drugs known to be associated with neutropenia or agranulocytosis; if an alternative is not possible, monitor absolute neutrophil count more frequently.

• deflazacort

  ribociclib 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

  ribociclib increases toxicity of degarelix by QTc interval. Avoid or Use Alternate Drug.

• delavirdine

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

• desflurane

  desflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• desipramine

  ribociclib increases toxicity of desipramine by QTc interval. Avoid or Use Alternate Drug.

• disopyramide

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

• dofetilide

  ribociclib and dofetilide both increase QTc interval. Avoid or Use Alternate Drug.
  
  dofetilide increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.

• dolasetron

  ribociclib increases toxicity of dolasetron by QTc interval. Avoid or Use Alternate Drug.

• donepezil

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

• doxepin

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

• doxorubicin

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

• doxorubicin liposomal

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

• dronedarone

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

• droperidol

  ribociclib increases toxicity of droperidol by QTc interval. Avoid or Use Alternate Drug.

• efavirenz

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

• elacestrant

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

• eliglustat

  eliglustat and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  elvitegravir/cobicistat/emtricitabine/tenofovir DF will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• encorafenib

  ribociclib 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 moderate CYP3A4 inhibitor is unavoidable, reduce encorafenib dose to one-half of the dose (eg, reduce from 450 mg/day to 225 mg/day). After discontinuing the inhibitor for 3-5 elimination half-lives, resume previous encorafenib dose.
  
  encorafenib and ribociclib 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.
  
  ribociclib increases toxicity of encorafenib by QTc interval. Avoid or Use Alternate Drug.

• entrectinib

  ribociclib and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of moderate CYP3A4 inhibitors with entrectinib, a CYP3A4 substrate. If coadministration unavoidable, reduce dose to 200 mg/day for patients aged 12 y or older with BSA >1.50m2. Resume previous entrectinib dose after discontinuing moderate CYP3A inhibitor for 3-5 elimination half-lives.

• enzalutamide

  enzalutamide will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.
  
  ribociclib will increase the level or effect of enzalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erdafitinib

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

• eribulin

  ribociclib increases toxicity of eribulin by QTc interval. Avoid or Use Alternate Drug.

• erythromycin base

  ribociclib increases toxicity of erythromycin base by QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  ribociclib increases toxicity of erythromycin ethylsuccinate by QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  ribociclib increases toxicity of erythromycin lactobionate by QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  ribociclib increases toxicity of erythromycin stearate by QTc interval. Avoid or Use Alternate Drug.

• escitalopram

  ribociclib increases toxicity of escitalopram by QTc interval. Avoid or Use Alternate Drug.
  
  escitalopram increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.

• ethinylestradiol

  ethinylestradiol decreases effects of letrozole by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Letrozole should not be given concurrently with any estrogens or estrogen-containing products.

• ezogabine

  ribociclib increases toxicity of ezogabine by QTc interval. Avoid or Use Alternate Drug. Slight and transient QT-prolongation observed, particularly when dose titrated to 1200mg/day. QT interval should be monitored when ezogabine is prescribed with agents known to increase QT interval.

• fexinidazole

  fexinidazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels and/or prolong QT interval.
  
  fexinidazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• fingolimod

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

• flecainide

  ribociclib increases toxicity of flecainide by QTc interval. Avoid or Use Alternate Drug.

• flibanserin

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

• fluoxetine

  ribociclib will increase the level or effect of fluoxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of fluoxetine by QTc interval. Avoid or Use Alternate Drug.

• fosamprenavir

  fosamprenavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• foscarnet

  ribociclib increases toxicity of foscarnet by QTc interval. Avoid or Use Alternate Drug.

• fosphenytoin

  fosphenytoin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• gemifloxacin

  ribociclib increases toxicity of gemifloxacin by QTc interval. Avoid or Use Alternate Drug.

• gilteritinib

  gilteritinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• glasdegib

  ribociclib and glasdegib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, monitor for increased risk of QTc interval prolongation.

• granisetron

  granisetron and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• grapefruit

  grapefruit will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day. Also avoid pomegranates or pomegranate juice, and grapefruits.

• haloperidol

  ribociclib and haloperidol both increase QTc interval. Avoid or Use Alternate Drug.

• hydroxychloroquine sulfate

  hydroxychloroquine sulfate and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of hydroxychloroquine sulfate by QTc interval. Avoid or Use Alternate Drug.

• hydroxyzine

  hydroxyzine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• ibutilide

  ribociclib and ibutilide both increase QTc interval. Avoid or Use Alternate Drug.

• idelalisib

  idelalisib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• iloperidone

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

• indacaterol, inhaled

  ribociclib increases toxicity of indacaterol, inhaled by QTc interval. Avoid or Use Alternate Drug.

• indinavir

  indinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• infigratinib

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

• inotuzumab

  inotuzumab and ribociclib 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.
  
  ribociclib increases toxicity of inotuzumab by QTc interval. Avoid or Use Alternate Drug.

• isoflurane

  isoflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• istradefylline

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

• itraconazole

  itraconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  itraconazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• ivosidenib

  ivosidenib and ribociclib 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.

• ketoconazole

  ketoconazole, ribociclib. Either increases effects of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of ketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ketoconazole increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.

• lapatinib

  ribociclib increases toxicity of lapatinib by QTc interval. Avoid or Use Alternate Drug.

• larotrectinib

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

• lemborexant

  ribociclib 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.

• levofloxacin

  ribociclib increases toxicity of levofloxacin by QTc interval. Avoid or Use Alternate Drug.

• levoketoconazole

  levoketoconazole, ribociclib. Either increases effects of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  levoketoconazole increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of levoketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• lithium

  lithium and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• lomitapide

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

• lopinavir

  lopinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib and lopinavir both increase QTc interval. Avoid or Use Alternate Drug.

• lumacaftor/ivacaftor

  lumacaftor/ivacaftor will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.
  
  ribociclib will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• lumefantrine

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

• lurbinectedin

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

• macimorelin

  macimorelin and ribociclib 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

  ribociclib increases toxicity of maprotiline by QTc interval. Avoid or Use Alternate Drug.

• medroxyprogesterone

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

• mefloquine

  ribociclib increases toxicity of mefloquine by QTc interval. Avoid or Use Alternate Drug.

• methadone

  ribociclib and methadone both increase QTc interval. Avoid or Use Alternate Drug.

• midazolam intranasal

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

• mifepristone

  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.

• mirtazapine

  mirtazapine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• mitotane

  mitotane will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• mobocertinib

  ribociclib will increase the level or effect of mobocertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If use of moderate CYP3A4 inhibitor unavoidable, reduce mobocertinib dose by ~50% (eg, 160 to 80 mg); closely monitor QTc interval.
  
  mobocertinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, reduce mobocertinib dose and monitor QTc interval more frequently.

• moxifloxacin

  ribociclib and moxifloxacin both increase QTc interval. Avoid or Use Alternate Drug.

• nefazodone

  nefazodone will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• nelfinavir

  nelfinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• neratinib

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

• nicardipine

  nicardipine will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• nilotinib

  ribociclib and nilotinib both increase QTc interval. Avoid or Use Alternate Drug.

• nortriptyline

  ribociclib will increase the level or effect of nortriptyline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of nortriptyline by QTc interval. Avoid or Use Alternate Drug.

• octreotide

  ribociclib increases toxicity of octreotide by QTc interval. Avoid or Use Alternate Drug.

• ofloxacin

  ribociclib increases toxicity of ofloxacin by QTc interval. Avoid or Use Alternate Drug.

• olanzapine

  ribociclib increases toxicity of olanzapine by QTc interval. Avoid or Use Alternate Drug. Limited data, including some case reports, suggest that olanzapine may be associated with a significant prolongation of the QTc interval in rare instances.

• omaveloxolone

  ribociclib will increase the level or effect of omaveloxolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unavoidable, reduce omaveloxolone dose to 100 mg/day. Closely monitor for adverse effects. If adverse effects emerge, further reduce to 50 mg/day.

• ondansetron

  ribociclib and ondansetron both increase QTc interval. Avoid or Use Alternate Drug.

• osilodrostat

  ribociclib and osilodrostat both increase QTc interval. Avoid or Use Alternate Drug. Dose dependent QT prolongation - avoid drugs known to prolong the QT interval

• osimertinib

  ribociclib increases toxicity of osimertinib by QTc interval. Avoid or Use Alternate Drug.

• oxaliplatin

  oxaliplatin and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• pacritinib

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

• palifermin

  palifermin increases toxicity of ribociclib by Other (see comment). Avoid or Use Alternate Drug. Comment: Palifermin should not be administered within 24 hr before, during infusion of, or within 24 hr after administration of antineoplastic agents. Coadministration of palifermin within 24 hr of chemotherapy resulted in increased severity and duration of oral mucositis.

• paliperidone

  ribociclib and paliperidone both increase QTc interval. Avoid or Use Alternate Drug.

• panobinostat

  ribociclib increases toxicity of panobinostat by QTc interval. Avoid or Use Alternate Drug.

• pasireotide

  ribociclib increases toxicity of pasireotide by QTc interval. Avoid or Use Alternate Drug.

• pazopanib

  ribociclib increases toxicity of pazopanib by QTc interval. Avoid or Use Alternate Drug.

• pemigatinib

  ribociclib 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

  ribociclib increases toxicity of pentamidine by QTc interval. Avoid or Use Alternate Drug.

• perphenazine

  ribociclib increases toxicity of perphenazine by QTc interval. Avoid or Use Alternate Drug.

• pexidartinib

  ribociclib 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.

• phenobarbital

  phenobarbital will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• phenytoin

  phenytoin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• pimavanserin

  ribociclib and pimavanserin both increase QTc interval. Avoid or Use Alternate Drug.

• pimozide

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

• pitolisant

  ribociclib and pitolisant both increase QTc interval. Avoid or Use Alternate Drug.

• ponatinib

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

• posaconazole

  posaconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• primaquine

  primaquine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• primidone

  primidone will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• procainamide

  ribociclib and procainamide both increase QTc interval. Avoid or Use Alternate Drug.

• propafenone

  ribociclib will increase the level or effect of propafenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of propafenone by QTc interval. Avoid or Use Alternate Drug.

• protriptyline

  ribociclib increases toxicity of protriptyline by QTc interval. Avoid or Use Alternate Drug.

• quetiapine

  ribociclib and quetiapine both increase QTc interval. Avoid or Use Alternate Drug.

• quinidine

  ribociclib and quinidine both increase QTc interval. Avoid or Use Alternate Drug.

• quinine

  ribociclib increases toxicity of quinine by QTc interval. Avoid or Use Alternate Drug.

• rifampin

  rifampin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• rilpivirine

  ribociclib increases toxicity of rilpivirine by QTc interval. Avoid or Use Alternate Drug.

• risperidone

  ribociclib increases toxicity of risperidone by QTc interval. Avoid or Use Alternate Drug.

• ritonavir

  ritonavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• romidepsin

  ribociclib will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of romidepsin by QTc interval. Avoid or Use Alternate Drug.

• saquinavir

  saquinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• selpercatinib

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

• selumetinib

  ribociclib 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

  ribociclib increases toxicity of sertraline by QTc interval. Avoid or Use Alternate Drug.

• sevoflurane

  sevoflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• silodosin

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

• siponimod

  ribociclib 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.
  
  siponimod and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• solifenacin

  ribociclib increases toxicity of solifenacin by QTc interval. Avoid or Use Alternate Drug.

• sorafenib

  ribociclib will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of sorafenib by QTc interval. Avoid or Use Alternate Drug.

• sotalol

  ribociclib and sotalol both increase QTc interval. Avoid or Use Alternate Drug.

• St John's Wort

  St John's Wort will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• sunitinib

  ribociclib increases toxicity of sunitinib by QTc interval. Avoid or Use Alternate Drug.

• tacrolimus

  ribociclib increases toxicity of tacrolimus by QTc interval. Avoid or Use Alternate Drug.

• tamoxifen

  ribociclib increases levels of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Concurrent use of ribociclib and tamoxifen is not indicated. Coadministration shown to increase tamoxifen AUC and Cmax. May increase risk of adverse effects.
  
  tamoxifen decreases levels of letrozole by unspecified interaction mechanism. Contraindicated. Letrozole should not be given concurrently with tamoxifen. Letrozole therapy after the completion of standard tamoxifen treatment is not associated with impaired effects of letrozole.

• tazemetostat

  ribociclib 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 moderate CYP3A4 inhibitors. If coadministration is unavoidable, reduce tazemetostat current dose (see drug monograph Dosage Modifications).

• telavancin

  ribociclib increases toxicity of telavancin by QTc interval. Avoid or Use Alternate Drug.

• tetrabenazine

  ribociclib and tetrabenazine both increase QTc interval. Avoid or Use Alternate Drug.

• thioridazine

  ribociclib and thioridazine both increase QTc interval. Avoid or Use Alternate Drug.

• ticagrelor

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

• tipranavir

  tipranavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Inform patients to avoid pomegranate or pomegranate juice, and grapefruit or grapefruit juice
  
  ribociclib will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.

• tofacitinib

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

• tolterodine

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

• tolvaptan

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

• toremifene

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

• trabectedin

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

• tramadol

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

• trazodone

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

• trimipramine

  ribociclib will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of trimipramine by QTc interval. Avoid or Use Alternate Drug.

• tucatinib

  tucatinib will increase the level or effect of ribociclib 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

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

• valbenazine

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

• vandetanib

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

• vardenafil

  ribociclib increases toxicity of vardenafil by QTc interval. Avoid or Use Alternate Drug.

• vemurafenib

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

• venetoclax

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

• venlafaxine

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

• vilanterol/fluticasone furoate inhaled

  ribociclib will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vilazodone

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

• vincristine

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

• vorapaxar

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

• voriconazole

  voriconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Inform patients to avoid pomegranate or pomegranate juice, and grapefruit or grapefruit juice
  
  ribociclib will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of voriconazole by QTc interval. Avoid or Use Alternate Drug.

• vorinostat

  ribociclib increases toxicity of vorinostat by QTc interval. Avoid or Use Alternate Drug.

• voxelotor

  voxelotor will increase the level or effect of ribociclib 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.

• ziprasidone

  ribociclib and ziprasidone both increase QTc interval. Avoid or Use Alternate Drug.

Monitor Closely (254)

• abemaciclib

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

• acalabrutinib

  ribociclib will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease acalabrutinib dose to 100 mg once daily if coadministered with a moderate CYP3A inhibitor.

• ado-trastuzumab emtansine

  ribociclib will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• albuterol

  albuterol and ribociclib both increase QTc interval. Use Caution/Monitor.

• alfentanil

  ribociclib will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• alfuzosin

  ribociclib and alfuzosin both increase QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• almotriptan

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

• alosetron

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

• alprazolam

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

• amlodipine

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

• apixaban

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

• arformoterol

  ribociclib increases toxicity of arformoterol by QTc interval. Use Caution/Monitor.

• aripiprazole

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

• atazanavir

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

• atogepant

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

• atorvastatin

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

• avanafil

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

• axitinib

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

• azithromycin

  azithromycin increases toxicity of ribociclib by QTc interval. Use Caution/Monitor.

• benzhydrocodone/acetaminophen

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

• bexarotene

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

• bortezomib

  ribociclib 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 ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of ribociclib with strong CYP3A inducers should be avoided.
  
  ribociclib will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• brentuximab vedotin

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

• brexpiprazole

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

• buprenorphine

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

• buprenorphine subdermal implant

  ribociclib will increase the level or effect of buprenorphine subdermal implant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor patients already on buprenorphine subdermal implant who require newly-initiated treatment with CYP3A4 inhibitors for signs and symptoms of overmedication. If the dose of the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, implant removal may be necessary and the patient should then be treated with a buprenorphine dosage form that permits dose adjustments. If a CYP3A4 inhibitor is discontinued in a patient who has been stabilized on buprenorphine, monitor the patient for withdrawal.

• buprenorphine transdermal

  ribociclib will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• buprenorphine, long-acting injection

  ribociclib will increase the level or effect of buprenorphine, long-acting injection by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Patients who transfer to buprenorphine long-acting injection from transmucosal buprenorphine coadministered with CYP3A4 inhibitors should be monitored to ensure buprenorphine plasma levels are adequate. Within 2 weeks, if signs and symptoms of buprenorphine toxicity or overdose occur and the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, transition the patient back to a buprenorphine formulation that permits dose adjustments.

• buspirone

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

• cabozantinib

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

• calcitriol

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

• cannabidiol

  ribociclib 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 moderate CYP3A4 inhibitor.

• capmatinib

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

• carbamazepine

  ribociclib will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• cariprazine

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

• cenobamate

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

• cevimeline

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

• chlordiazepoxide

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

• chloroquine

  chloroquine increases toxicity of ribociclib by QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cholera vaccine

  letrozole decreases effects of cholera vaccine by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs and corticosteroids (used in greater than physiologic doses), may reduce the immune response to cholera vaccine.

• cilostazol

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

• cinacalcet

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

• clonazepam

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

• clonidine

  ribociclib will increase the level or effect of clonidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• clorazepate

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

• codeine

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

• conjugated estrogens

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

• copanlisib

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

• cyclosporine

  ribociclib will increase the level or effect of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• dabrafenib

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

• daclatasvir

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

• daridorexant

  ribociclib will increase the level or effect of daridorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Daridorexant dose should not exceed 25 mg per night when coadministered with moderate CYP3A4 inhibitors.

• dasatinib

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

• dengue vaccine

  ribociclib decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.
  
  letrozole decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.

• deutetrabenazine

  ribociclib increases toxicity of deutetrabenazine by QTc interval. Use Caution/Monitor. At the maximum recommended dose, deutetrabenazine does not prolong QT interval to a clinically relevant extent. Certain circumstances may increase risk of torsade de pointes and/or sudden death in association with drugs that prolong the QTc interval (eg, bradycardia, hypokalemia or hypomagnesemia, coadministration with other drugs that prolong QTc interval, presence of congenital QT prolongation).

• eluxadoline

  letrozole increases levels of eluxadoline by decreasing metabolism. Use Caution/Monitor. As a precautionary measure due to incomplete information on the metabolism of eluxadoline, use caution when coadministered with strong CYP2A6 inhibitors.

• dexamethasone

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

• diazepam

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

• diazepam intranasal

  ribociclib 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.

• dihydroergotamine

  ribociclib will increase the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• dihydroergotamine intranasal

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

• diltiazem

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

• docetaxel

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

• donepezil transdermal

  ribociclib will increase the level or effect of donepezil transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dronabinol

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

• dutasteride

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

• duvelisib

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

• efavirenz

  efavirenz will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• elagolix

  elagolix decreases levels of ribociclib 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.
  
  ribociclib will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• elbasvir/grazoprevir

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

• eletriptan

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

• eliglustat

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

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  ribociclib will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• encorafenib

  encorafenib, ribociclib. 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.

• eplerenone

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

• ergoloid mesylates

  ribociclib will increase the level or effect of ergoloid mesylates by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ergonovine

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

• ergotamine

  ribociclib will increase the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• erlotinib

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

• erythromycin base

  ribociclib will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin ethylsuccinate

  ribociclib will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin lactobionate

  ribociclib will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• erythromycin stearate

  ribociclib will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• escitalopram

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

• estradiol

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

• estrogens conjugated synthetic

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

• estrogens esterified

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

• estropipate

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

• eszopiclone

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

• ethinylestradiol

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

• ethosuximide

  ribociclib will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• etonogestrel

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

• etoposide

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

• everolimus

  ribociclib will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• exemestane

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

• fedratinib

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

• felbamate

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

• felodipine

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

• fentanyl

  ribociclib will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl intranasal

  ribociclib will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl transdermal

  ribociclib will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl transmucosal

  ribociclib will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• finerenone

  ribociclib will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor serum potassium during initiation and dosage adjustment of either finererone or moderate CYP3A4 inhibitors. Adjust finererone dosage as needed.

• flunisolide inhaled

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

• fluphenazine

  ribociclib increases toxicity of fluphenazine by QTc interval. Use Caution/Monitor.

• flurazepam

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

• fluticasone furoate

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

• fluticasone inhaled

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

• fluticasone intranasal

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

• formoterol

  ribociclib increases toxicity of formoterol by QTc interval. Use Caution/Monitor.

• fosamprenavir

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

• fostamatinib

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

• fostemsavir

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

• gadobenate

  gadobenate and ribociclib both increase QTc interval. Use Caution/Monitor.

• gefitinib

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

• gemtuzumab

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

• glasdegib

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

• guanfacine

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

• haloperidol

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

• hydrocodone

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

• hydroxyprogesterone caproate (DSC)

  ribociclib will increase the level or effect of hydroxyprogesterone caproate (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ibrutinib

  ribociclib increases levels of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with moderate CYP3A4 inhibitors, reduce ibrutinib dose to 280 mg qDay (B-cell malignancies) or 420 mg qDay (graft versus host disease). After CYP3A inhibitor discontinuation, resume previous dose of ibrutinib.

• idelalisib

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

• ifosfamide

  ribociclib decreases effects of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Use of a CYP3A4 inhibitor may decrease metabolism of ifosfamide, potentially reducing ifosfamide therapeutic effects. .

• imatinib

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

• imipramine

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

• indinavir

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

• irinotecan

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

• irinotecan liposomal

  ribociclib will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. UGT1A1 inhibitors decrease irinotecan metabolism

• isavuconazonium sulfate

  ribociclib will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• isosorbide dinitrate

  ribociclib will increase the level or effect of isosorbide dinitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• isosorbide mononitrate

  ribociclib will increase the level or effect of isosorbide mononitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• isradipine

  ribociclib will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ribociclib increases toxicity of isradipine by QTc interval. Use Caution/Monitor.

• istradefylline

  istradefylline will increase the level or effect of ribociclib 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

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

• ivacaftor

  ribociclib 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 moderate CYP3A4 inhibitors. See specific ivacaftor-containing product for precise dosage modification.

• ivosidenib

  ribociclib will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with moderate CYP3A4 inhibitors may increase ivosidenib plasma concentrations, thus increasing the risk of QTc prolongation. Monitor for increased risk of QTc interval prolongation.

• ixabepilone

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

• ketamine

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

• lapatinib

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

• lefamulin

  ribociclib will increase the level or effect of lefamulin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for adverse effects if lefamulin is coadministered with moderate CYP3A inhibitors.

• lenacapavir

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

• letermovir

  letermovir increases levels of letrozole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  letermovir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levamlodipine

  ribociclib 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.

• mavacamten

  letrozole will increase the level or effect of mavacamten by affecting hepatic enzyme CYP2C19 metabolism. Modify Therapy/Monitor Closely. Inititiation of weak CYP2C19 inhibitors may require decreased mavacamten dose.

• levomilnacipran

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

• levonorgestrel intrauterine

  ribociclib will increase the level or effect of levonorgestrel intrauterine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levonorgestrel oral

  ribociclib will increase the level or effect of levonorgestrel oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lofexidine

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

• lopinavir

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

• lorlatinib

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

• lovastatin

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

• lumateperone

  ribociclib will increase the level or effect of lumateperone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce lumateperone dose to 21 mg/day if coadministered with moderate CYP3A4 inhibitors.

• lurasidone

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

• maraviroc

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

• marijuana

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

• mavacamten

  ribociclib will increase the level or effect of mavacamten by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Inititiation of moderate CYP3A4 inhibitors may require decreased mavacamten dose.

• mefloquine

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

• mestranol

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

• methylergonovine

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

• midazolam

  ribociclib will increase the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• midostaurin

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

• mifepristone

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

• mirtazapine

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

• modafinil

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

• mometasone inhaled

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

• nafcillin

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

• naldemedine

  ribociclib increases levels of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor naldemedine for potential adverse effects if coadministered with strong or moderate CYP3A4 inhibitors.

• nefazodone

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

• nelfinavir

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

• netupitant/palonosetron

  ribociclib will increase the level or effect of netupitant/palonosetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nevirapine

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

• nicardipine

  ribociclib will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• nifedipine

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

• nilotinib

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

• nimodipine

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

• nisoldipine

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

• ofatumumab SC

  ofatumumab SC, ribociclib. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Consider the risk of additive immune system effects when coadministering immunosuppressive therapies with coadministration. When switching from therapies with immune effects, take into account the duration and mechanism of action of these therapies when initiating ofatumumab SC.

• olaparib

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

• oliceridine

  ribociclib 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

  ribociclib will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  ribociclib will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• ondansetron

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

• osilodrostat

  osilodrostat and ribociclib both increase QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ospemifene

  ribociclib 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 ribociclib by Other (see comment). Use Caution/Monitor. Monitor for ECG changes if therapy is initiated in patients with drugs known to prolong QT interval.

• oxybutynin

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

• oxybutynin transdermal

  ribociclib will increase the level or effect of oxybutynin transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• oxycodone

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

• ozanimod

  ozanimod and ribociclib 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

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

• paclitaxel protein bound

  ribociclib will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• palbociclib

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

• panobinostat

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

• paricalcitol

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

• pazopanib

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

• pimavanserin

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

• polatuzumab vedotin

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

• quazepam

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

• quetiapine

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

• quinidine

  ribociclib will increase the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• quinine

  ribociclib will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• ramelteon

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

• ranolazine

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

• regorafenib

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

• repaglinide

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

• rifabutin

  rifabutin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifapentine

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

• rimegepant

  ribociclib will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid repeating rimegepant dose within 48 hr if coadministered with a moderate CYP3A4 inhibitor.

• ritonavir

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

• roflumilast

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

• rucaparib

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

• saxagliptin

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

• sildenafil

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

• simvastatin

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

• siponimod

  siponimod and letrozole both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.
  
  siponimod and ribociclib both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.

• sirolimus

  ribociclib will increase the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• sodium sulfate/?magnesium sulfate/potassium chloride

  sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of ribociclib by QTc interval. Use Caution/Monitor. Consider predose and post-colonoscopy ECGs in patients at increased risk of serious cardiac arrhythmias. .

• sodium sulfate/potassium sulfate/magnesium sulfate

  sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of ribociclib by QTc interval. Use Caution/Monitor. Consider predose and post-colonoscopy ECGs in patients at increased risk of serious cardiac arrhythmias. .

• solifenacin

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

• sonidegib

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

• sparsentan

  ribociclib will increase the level or effect of sparsentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No dosage adjustment needed. Monitor blood pressure, serum potassium, edema, and kidney function regularly if sparsentan is coadministered with moderate CYP3A4 inhibitors.

• stiripentol

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

• sufentanil

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

• sufentanil SL

  ribociclib 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

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

• suvorexant

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

• tacrolimus

  ribociclib will increase the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• tadalafil

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

• tamsulosin

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

• tazemetostat

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

• tecovirimat

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

• temsirolimus

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

• tezacaftor

  ribociclib will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust tezacaftor dosage regimen if coadministered with a moderate CYP3A inhibitor.

• ticlopidine

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

• tinidazole

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

• trastuzumab

  trastuzumab, ribociclib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy.

• trastuzumab deruxtecan

  trastuzumab deruxtecan, ribociclib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy.

• triazolam

  ribociclib will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• triclabendazole

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

• ulipristal

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

• umeclidinium bromide/vilanterol inhaled

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

• upadacitinib

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

• vardenafil

  ribociclib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors

• verapamil

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

• vilanterol/fluticasone furoate inhaled

  ribociclib increases toxicity of vilanterol/fluticasone furoate inhaled by QTc interval. Use Caution/Monitor.

• vinblastine

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

• vinorelbine

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

• voclosporin

  ribociclib will increase the level or effect of voclosporin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce voclosporin daily dosage to 15.8 mg PO in AM and 7.9 mg PO in PM.
  
  voclosporin, ribociclib. Either increases effects of the other by QTc interval. Use Caution/Monitor.

• zaleplon

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

• zanubrutinib

  ribociclib will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib (a CYP3A4 substrate) to 80 mg PO BID to when coadministered with a moderate CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib.

• zolpidem

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

Minor (69)

• acetazolamide

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

• alpelisib

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

• ambrisentan

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

• anastrozole

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

• apremilast

  ribociclib will decrease the level or effect of apremilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• armodafinil

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

• avatrombopag

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

• benzphetamine

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

• busulfan

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

• calcifediol

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

• chlorpheniramine

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

• ciclesonide inhaled

  ribociclib will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cisapride

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

• cocaine topical

  ribociclib will increase the level or effect of cocaine topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cyclophosphamide

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

• dantrolene

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

• dapsone

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

• dexlansoprazole

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

• doravirine

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

• doxepin cream

  ribociclib will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enfortumab vedotin

  ribociclib will increase the level or effect of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• esomeprazole

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

• estradiol vaginal

  ribociclib will increase the level or effect of estradiol vaginal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate

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

• fenofibrate micronized

  ribociclib will increase the level or effect of fenofibrate micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibric acid

  ribociclib will increase the level or effect of fenofibric acid by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flutamide

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

• glecaprevir/pibrentasvir

  ribociclib will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ixazomib

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

• lacosamide

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

• lansoprazole

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

• linagliptin

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

• losartan

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

• macimorelin

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

• metaxalone

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

• methylprednisolone

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

• miconazole oral

  ribociclib will increase the level or effect of miconazole oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• montelukast

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

• norethindrone

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

• norgestrel

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

• omeprazole

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

• osimertinib

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

• perampanel

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

• pitolisant

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

• pomalidomide

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

• praziquantel

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

• primaquine

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

• progesterone intravaginal gel

  ribociclib will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone micronized

  ribociclib will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone, natural

  ribociclib will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rabeprazole

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

• riociguat

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

• rivaroxaban

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

• rolapitant

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

• ropivacaine

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

• ruxolitinib

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

• ruxolitinib topical

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

• salmeterol

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

• sofosbuvir/velpatasvir

  ribociclib will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tasimelteon

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

• teniposide

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

• theophylline

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

• tiagabine

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

• trimethoprim

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

• velpatasvir

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

• vincristine liposomal

  ribociclib will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vortioxetine

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

• voxilaprevir

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

• zonisamide

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

• abemaciclib

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

• acalabrutinib

  Monitor Closely (1)ribociclib will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease acalabrutinib dose to 100 mg once daily if coadministered with a moderate CYP3A inhibitor.

• acetazolamide

  Minor (1)acetazolamide will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• adagrasib

  Serious - Use Alternative (1)adagrasib, ribociclib. Either increases effects of the other by QTc interval. Avoid or Use Alternate Drug. Each drug prolongs the QTc interval, which may increased the risk of Torsade de pointes, other serious arryhthmias, and sudden death. If coadministration unavoidable, more frequent monitoring is recommended for such patients.

• ado-trastuzumab emtansine

  Monitor Closely (1)ribociclib will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• albuterol

  Monitor Closely (1)albuterol and ribociclib both increase QTc interval. Use Caution/Monitor.

• alfentanil

  Monitor Closely (1)ribociclib will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• alfuzosin

  Monitor Closely (2)ribociclib and alfuzosin both increase QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)alfuzosin and ribociclib both increase QTc interval. Contraindicated.

• almotriptan

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

• alosetron

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

• alpelisib

  Minor (1)ribociclib will increase the level or effect of alpelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alprazolam

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

• ambrisentan

  Minor (1)ribociclib will increase the level or effect of ambrisentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• amiodarone

  Serious - Use Alternative (2)ribociclib will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and amiodarone both increase QTc interval. Avoid or Use Alternate Drug.

• amitriptyline

  Serious - Use Alternative (1)ribociclib increases toxicity of amitriptyline by QTc interval. Avoid or Use Alternate Drug.

• amlodipine

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

• anagrelide

  Serious - Use Alternative (1)ribociclib and anagrelide both increase QTc interval. Avoid or Use Alternate Drug.

• anastrozole

  Minor (1)anastrozole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apalutamide

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

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

• apomorphine

  Serious - Use Alternative (1)ribociclib increases toxicity of apomorphine by QTc interval. Avoid or Use Alternate Drug.

• apremilast

  Minor (1)ribociclib will decrease the level or effect of apremilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aprepitant

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

• arformoterol

  Monitor Closely (1)ribociclib increases toxicity of arformoterol by QTc interval. Use Caution/Monitor.

• aripiprazole

  Monitor Closely (1)ribociclib will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)aripiprazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• armodafinil

  Minor (1)ribociclib will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• arsenic trioxide

  Serious - Use Alternative (1)ribociclib and arsenic trioxide both increase QTc interval. Avoid or Use Alternate Drug.

• artemether

  Serious - Use Alternative (1)artemether and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• artemether/lumefantrine

  Serious - Use Alternative (2)ribociclib and artemether/lumefantrine both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• asenapine

  Serious - Use Alternative (1)ribociclib and asenapine both increase QTc interval. Avoid or Use Alternate Drug.

• asenapine transdermal

  Serious - Use Alternative (1)asenapine transdermal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• atazanavir

  Monitor Closely (1)ribociclib will increase the level or effect of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)atazanavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• atogepant

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

• atomoxetine

  Serious - Use Alternative (1)atomoxetine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• atorvastatin

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

• avanafil

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

• avapritinib

  Serious - Use Alternative (1)ribociclib 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 moderate CYP3A4 inhibitors. If unable to avoid, reduce avapritinib starting dose. See drug monograph Dosage Modifications.

• avatrombopag

  Minor (1)ribociclib will increase the level or effect of avatrombopag by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• axitinib

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

• azithromycin

  Monitor Closely (1)azithromycin increases toxicity of ribociclib by QTc interval. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of azithromycin by QTc interval. Avoid or Use Alternate Drug.

• bedaquiline

  Serious - Use Alternative (2)ribociclib will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of bedaquiline by QTc interval. Avoid or Use Alternate Drug.

• benzhydrocodone/acetaminophen

  Monitor Closely (1)ribociclib will increase the level or effect of benzhydrocodone/acetaminophen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with strong CYP3A4 inhibitors may increase hydrocodone (benzhydrocodone is prodrug of hydrocodone) plasma concentrations and can result in potentially fatal respiratory depression.

• benzphetamine

  Minor (1)ribociclib will increase the level or effect of benzphetamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bexarotene

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

• bortezomib

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

• bosentan

  Monitor Closely (2)ribociclib will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  bosentan will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• bosutinib

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

• brentuximab vedotin

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

• brexpiprazole

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

• brigatinib

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

• bromocriptine

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

• budesonide

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

• buprenorphine

  Monitor Closely (1)ribociclib will increase the level or effect of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)buprenorphine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine buccal

  Serious - Use Alternative (1)buprenorphine buccal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine subdermal implant

  Monitor Closely (1)ribociclib will increase the level or effect of buprenorphine subdermal implant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor patients already on buprenorphine subdermal implant who require newly-initiated treatment with CYP3A4 inhibitors for signs and symptoms of overmedication. If the dose of the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, implant removal may be necessary and the patient should then be treated with a buprenorphine dosage form that permits dose adjustments. If a CYP3A4 inhibitor is discontinued in a patient who has been stabilized on buprenorphine, monitor the patient for withdrawal.Serious - Use Alternative (1)buprenorphine subdermal implant and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine transdermal

  Monitor Closely (1)ribociclib will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)buprenorphine transdermal and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine, long-acting injection

  Monitor Closely (1)ribociclib will increase the level or effect of buprenorphine, long-acting injection by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Patients who transfer to buprenorphine long-acting injection from transmucosal buprenorphine coadministered with CYP3A4 inhibitors should be monitored to ensure buprenorphine plasma levels are adequate. Within 2 weeks, if signs and symptoms of buprenorphine toxicity or overdose occur and the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, transition the patient back to a buprenorphine formulation that permits dose adjustments.Serious - Use Alternative (1)buprenorphine, long-acting injection and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• buspirone

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

• busulfan

  Minor (1)ribociclib will increase the level or effect of busulfan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cabozantinib

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

• calcifediol

  Minor (1)ribociclib will increase the level or effect of calcifediol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• calcitriol

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

• cannabidiol

  Monitor Closely (1)ribociclib 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 moderate CYP3A4 inhibitor.

• capmatinib

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

• carbamazepine

  Monitor Closely (1)ribociclib will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.Serious - Use Alternative (1)carbamazepine will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• cariprazine

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

• cenobamate

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

• ceritinib

  Serious - Use Alternative (3)ribociclib, ceritinib. Either increases toxicity of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. May increase QT prolongation.
  
  ceritinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ceritinib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cevimeline

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

• chloramphenicol

  Serious - Use Alternative (1)chloramphenicol will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• chlordiazepoxide

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

• chloroquine

  Monitor Closely (2)chloroquine increases toxicity of ribociclib by QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and chloroquine both increase QTc interval. Avoid or Use Alternate Drug.

• chlorpheniramine

  Minor (1)ribociclib will increase the level or effect of chlorpheniramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chlorpromazine

  Serious - Use Alternative (1)ribociclib increases toxicity of chlorpromazine by QTc interval. Avoid or Use Alternate Drug.

• chlorpropamide

  Serious - Use Alternative (1)ribociclib and chlorpropamide both increase QTc interval. Avoid or Use Alternate Drug.

• cholera vaccine

  Monitor Closely (1)letrozole decreases effects of cholera vaccine by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs and corticosteroids (used in greater than physiologic doses), may reduce the immune response to cholera vaccine.

• ciclesonide inhaled

  Minor (1)ribociclib will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cilostazol

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

• cinacalcet

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

• ciprofloxacin

  Serious - Use Alternative (1)ribociclib increases toxicity of ciprofloxacin by QTc interval. Avoid or Use Alternate Drug.

• cisapride

  Minor (1)ribociclib will increase the level or effect of cisapride by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• citalopram

  Serious - Use Alternative (2)ribociclib will increase the level or effect of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and citalopram both increase QTc interval. Avoid or Use Alternate Drug.

• clarithromycin

  Serious - Use Alternative (3)ribociclib will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  clarithromycin will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib and clarithromycin both increase QTc interval. Avoid or Use Alternate Drug.

• clofazimine

  Serious - Use Alternative (1)ribociclib and clofazimine both increase QTc interval. Avoid or Use Alternate Drug.

• clomipramine

  Serious - Use Alternative (1)ribociclib increases toxicity of clomipramine by QTc interval. Avoid or Use Alternate Drug.

• clonazepam

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

• clonidine

  Monitor Closely (1)ribociclib will increase the level or effect of clonidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• clorazepate

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

• clozapine

  Serious - Use Alternative (2)ribociclib will increase the level or effect of clozapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of clozapine by QTc interval. Avoid or Use Alternate Drug.

• cobicistat

  Serious - Use Alternative (2)ribociclib will increase the level or effect of cobicistat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  cobicistat will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• cobimetinib

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

• cocaine topical

  Minor (1)ribociclib will increase the level or effect of cocaine topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• codeine

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

• colchicine

  Serious - Use Alternative (1)ribociclib 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)ribociclib will increase the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.Serious - Use Alternative (1)conivaptan will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• conjugated estrogens

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

• copanlisib

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

• crizotinib

  Serious - Use Alternative (2)ribociclib 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
  
  ribociclib increases toxicity of crizotinib by QTc interval. Avoid or Use Alternate Drug.

• cyclophosphamide

  Minor (2)ribociclib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  cyclophosphamide will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cyclosporine

  Monitor Closely (1)ribociclib will increase the level or effect of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• dabrafenib

  Monitor Closely (1)ribociclib will increase the level or effect of dabrafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)dabrafenib will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• daclatasvir

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

• dantrolene

  Minor (1)ribociclib will increase the level or effect of dantrolene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dapsone

  Minor (1)ribociclib will increase the level or effect of dapsone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• daridorexant

  Monitor Closely (1)ribociclib will increase the level or effect of daridorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Daridorexant dose should not exceed 25 mg per night when coadministered with moderate CYP3A4 inhibitors.

• darifenacin

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

• darunavir

  Serious - Use Alternative (2)ribociclib will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  darunavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• dasatinib

  Monitor Closely (1)ribociclib will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of dasatinib by QTc interval. Avoid or Use Alternate Drug.

• deferiprone

  Serious - Use Alternative (1)deferiprone, ribociclib. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid use of deferiprone with other drugs known to be associated with neutropenia or agranulocytosis; if an alternative is not possible, monitor absolute neutrophil count more frequently.

• deflazacort

  Serious - Use Alternative (1)ribociclib 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

  Serious - Use Alternative (1)ribociclib increases toxicity of degarelix by QTc interval. Avoid or Use Alternate Drug.

• delavirdine

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

• dengue vaccine

  Monitor Closely (2)ribociclib decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.
  
  letrozole decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.

• desflurane

  Serious - Use Alternative (1)desflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• desipramine

  Serious - Use Alternative (1)ribociclib increases toxicity of desipramine by QTc interval. Avoid or Use Alternate Drug.

• deutetrabenazine

  Monitor Closely (1)ribociclib increases toxicity of deutetrabenazine by QTc interval. Use Caution/Monitor. At the maximum recommended dose, deutetrabenazine does not prolong QT interval to a clinically relevant extent. Certain circumstances may increase risk of torsade de pointes and/or sudden death in association with drugs that prolong the QTc interval (eg, bradycardia, hypokalemia or hypomagnesemia, coadministration with other drugs that prolong QTc interval, presence of congenital QT prolongation).

• dexamethasone

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

• dexlansoprazole

  Minor (1)ribociclib will increase the level or effect of dexlansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diazepam

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

• diazepam intranasal

  Monitor Closely (1)ribociclib 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.

• dihydroergotamine

  Monitor Closely (1)ribociclib will increase the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• dihydroergotamine intranasal

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

• diltiazem

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

• disopyramide

  Serious - Use Alternative (2)ribociclib will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.
  
  ribociclib and disopyramide both increase QTc interval. Avoid or Use Alternate Drug.

• docetaxel

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

• dofetilide

  Serious - Use Alternative (2)ribociclib and dofetilide both increase QTc interval. Avoid or Use Alternate Drug.
  
  dofetilide increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.

• dolasetron

  Serious - Use Alternative (1)ribociclib increases toxicity of dolasetron by QTc interval. Avoid or Use Alternate Drug.

• donepezil

  Serious - Use Alternative (2)ribociclib will increase the level or effect of donepezil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  donepezil and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• donepezil transdermal

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

• doravirine

  Minor (1)ribociclib will increase the level or effect of doravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxepin

  Serious - Use Alternative (2)ribociclib will increase the level or effect of doxepin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  doxepin and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• doxepin cream

  Minor (1)ribociclib will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxorubicin

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

• doxorubicin liposomal

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

• dronabinol

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

• dronedarone

  Serious - Use Alternative (2)ribociclib will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and dronedarone both increase QTc interval. Avoid or Use Alternate Drug.

• droperidol

  Serious - Use Alternative (1)ribociclib increases toxicity of droperidol by QTc interval. Avoid or Use Alternate Drug.

• dutasteride

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

• duvelisib

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

• efavirenz

  Monitor Closely (1)efavirenz will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of ribociclib with strong CYP3A inducers should be avoided.Serious - Use Alternative (2)ribociclib will increase the level or effect of efavirenz by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  efavirenz and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• elacestrant

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

• elagolix

  Monitor Closely (2)ribociclib will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  elagolix decreases levels of ribociclib 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)ribociclib will increase the level or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• eletriptan

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

• eliglustat

  Monitor Closely (1)ribociclib will increase the level or effect of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)eliglustat and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• eluxadoline

  Monitor Closely (1)letrozole increases levels of eluxadoline by decreasing metabolism. Use Caution/Monitor. As a precautionary measure due to incomplete information on the metabolism of eluxadoline, use caution when coadministered with strong CYP2A6 inhibitors.

• elvitegravir

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

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  Monitor Closely (1)ribociclib will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)elvitegravir/cobicistat/emtricitabine/tenofovir DF will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• encorafenib

  Monitor Closely (1)encorafenib, ribociclib. 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 (3)ribociclib 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 moderate CYP3A4 inhibitor is unavoidable, reduce encorafenib dose to one-half of the dose (eg, reduce from 450 mg/day to 225 mg/day). After discontinuing the inhibitor for 3-5 elimination half-lives, resume previous encorafenib dose.
  
  ribociclib increases toxicity of encorafenib by QTc interval. Avoid or Use Alternate Drug.
  
  encorafenib and ribociclib 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

  Minor (1)ribociclib will increase the level or effect of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• entrectinib

  Serious - Use Alternative (2)ribociclib and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of moderate CYP3A4 inhibitors with entrectinib, a CYP3A4 substrate. If coadministration unavoidable, reduce dose to 200 mg/day for patients aged 12 y or older with BSA >1.50m2. Resume previous entrectinib dose after discontinuing moderate CYP3A inhibitor for 3-5 elimination half-lives.

• enzalutamide

  Serious - Use Alternative (2)ribociclib 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 ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• eplerenone

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

• erdafitinib

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

• ergoloid mesylates

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

• ergonovine

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

• ergotamine

  Monitor Closely (1)ribociclib will increase the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• eribulin

  Serious - Use Alternative (1)ribociclib increases toxicity of eribulin by QTc interval. Avoid or Use Alternate Drug.

• erlotinib

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

• erythromycin base

  Monitor Closely (1)ribociclib will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of erythromycin base by QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  Monitor Closely (1)ribociclib will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of erythromycin ethylsuccinate by QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  Monitor Closely (1)ribociclib will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of erythromycin lactobionate by QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  Monitor Closely (1)ribociclib will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of erythromycin stearate by QTc interval. Avoid or Use Alternate Drug.

• escitalopram

  Monitor Closely (1)ribociclib will increase the level or effect of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (2)ribociclib increases toxicity of escitalopram by QTc interval. Avoid or Use Alternate Drug.
  
  escitalopram increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.

• esomeprazole

  Minor (1)ribociclib will increase the level or effect of esomeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estradiol

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

• estradiol vaginal

  Minor (1)ribociclib will increase the level or effect of estradiol vaginal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estrogens conjugated synthetic

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

• estropipate

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

• eszopiclone

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

• ethinylestradiol

  Monitor Closely (1)ribociclib will increase the level or effect of ethinylestradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ethinylestradiol decreases effects of letrozole by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Letrozole should not be given concurrently with any estrogens or estrogen-containing products.

• ethosuximide

  Monitor Closely (1)ribociclib will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• etonogestrel

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

• etoposide

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

• everolimus

  Monitor Closely (1)ribociclib will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• exemestane

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

• ezogabine

  Serious - Use Alternative (1)ribociclib increases toxicity of ezogabine by QTc interval. Avoid or Use Alternate Drug. Slight and transient QT-prolongation observed, particularly when dose titrated to 1200mg/day. QT interval should be monitored when ezogabine is prescribed with agents known to increase QT interval.

• fedratinib

  Monitor Closely (2)fedratinib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.
  
  ribociclib will increase the level or effect of fedratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• felbamate

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

• felodipine

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

• fenofibrate

  Minor (1)ribociclib will increase the level or effect of fenofibrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate micronized

  Minor (1)ribociclib will increase the level or effect of fenofibrate micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibric acid

  Minor (1)ribociclib will increase the level or effect of fenofibric acid by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl

  Monitor Closely (1)ribociclib will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl intranasal

  Monitor Closely (1)ribociclib will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl transdermal

  Monitor Closely (1)ribociclib will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fentanyl transmucosal

  Monitor Closely (1)ribociclib will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• fexinidazole

  Serious - Use Alternative (2)fexinidazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels and/or prolong QT interval.
  
  fexinidazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• finerenone

  Monitor Closely (1)ribociclib will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor serum potassium during initiation and dosage adjustment of either finererone or moderate CYP3A4 inhibitors. Adjust finererone dosage as needed.

• fingolimod

  Serious - Use Alternative (2)ribociclib will increase the level or effect of fingolimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fingolimod and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• flecainide

  Serious - Use Alternative (1)ribociclib increases toxicity of flecainide by QTc interval. Avoid or Use Alternate Drug.

• flibanserin

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

• fluconazole

  Contraindicated (1)ribociclib increases toxicity of fluconazole by QTc interval. Contraindicated.

• flunisolide inhaled

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

• fluoxetine

  Serious - Use Alternative (2)ribociclib will increase the level or effect of fluoxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of fluoxetine by QTc interval. Avoid or Use Alternate Drug.

• fluphenazine

  Monitor Closely (1)ribociclib increases toxicity of fluphenazine by QTc interval. Use Caution/Monitor.

• flurazepam

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

• flutamide

  Minor (1)ribociclib will increase the level or effect of flutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluticasone furoate

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

• fluticasone inhaled

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

• fluticasone intranasal

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

• formoterol

  Monitor Closely (1)ribociclib increases toxicity of formoterol by QTc interval. Use Caution/Monitor.

• fosamprenavir

  Monitor Closely (1)ribociclib will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)fosamprenavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• fosaprepitant

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

• foscarnet

  Serious - Use Alternative (1)ribociclib increases toxicity of foscarnet by QTc interval. Avoid or Use Alternate Drug.

• fosphenytoin

  Serious - Use Alternative (1)fosphenytoin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• fostamatinib

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

• fostemsavir

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

• gadobenate

  Monitor Closely (1)gadobenate and ribociclib both increase QTc interval. Use Caution/Monitor.

• gefitinib

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

• gemifloxacin

  Serious - Use Alternative (1)ribociclib increases toxicity of gemifloxacin by QTc interval. Avoid or Use Alternate Drug.

• gemtuzumab

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

• gilteritinib

  Serious - Use Alternative (1)gilteritinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• glasdegib

  Monitor Closely (1)ribociclib will increase the level or effect of glasdegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and glasdegib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, monitor for increased risk of QTc interval prolongation.

• glecaprevir/pibrentasvir

  Minor (1)ribociclib will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• granisetron

  Serious - Use Alternative (1)granisetron and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• grapefruit

  Serious - Use Alternative (1)grapefruit will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day. Also avoid pomegranates or pomegranate juice, and grapefruits.

• guanfacine

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

• haloperidol

  Monitor Closely (1)ribociclib will increase the level or effect of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and haloperidol both increase QTc interval. Avoid or Use Alternate Drug.

• hydrocodone

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

• hydroxychloroquine sulfate

  Serious - Use Alternative (2)ribociclib increases toxicity of hydroxychloroquine sulfate by QTc interval. Avoid or Use Alternate Drug.
  
  hydroxychloroquine sulfate and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• hydroxyprogesterone caproate (DSC)

  Monitor Closely (1)ribociclib will increase the level or effect of hydroxyprogesterone caproate (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• hydroxyzine

  Serious - Use Alternative (1)hydroxyzine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• ibrutinib

  Monitor Closely (1)ribociclib increases levels of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with moderate CYP3A4 inhibitors, reduce ibrutinib dose to 280 mg qDay (B-cell malignancies) or 420 mg qDay (graft versus host disease). After CYP3A inhibitor discontinuation, resume previous dose of ibrutinib.

• ibutilide

  Serious - Use Alternative (1)ribociclib and ibutilide both increase QTc interval. Avoid or Use Alternate Drug.

• idelalisib

  Monitor Closely (1)ribociclib will increase the level or effect of idelalisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)idelalisib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• ifosfamide

  Monitor Closely (1)ribociclib decreases effects of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Use of a CYP3A4 inhibitor may decrease metabolism of ifosfamide, potentially reducing ifosfamide therapeutic effects. .

• iloperidone

  Serious - Use Alternative (2)ribociclib will increase the level or effect of iloperidone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and iloperidone both increase QTc interval. Avoid or Use Alternate Drug.

• imatinib

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

• imipramine

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

• indacaterol, inhaled

  Serious - Use Alternative (1)ribociclib increases toxicity of indacaterol, inhaled by QTc interval. Avoid or Use Alternate Drug.

• indinavir

  Monitor Closely (1)ribociclib will increase the level or effect of indinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)indinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• infigratinib

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

• inotuzumab

  Serious - Use Alternative (2)inotuzumab and ribociclib 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.
  
  ribociclib increases toxicity of inotuzumab by QTc interval. Avoid or Use Alternate Drug.

• irinotecan

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

• irinotecan liposomal

  Monitor Closely (1)ribociclib will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. UGT1A1 inhibitors decrease irinotecan metabolism

• isavuconazonium sulfate

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

• isoflurane

  Serious - Use Alternative (1)isoflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• isosorbide dinitrate

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

• isosorbide mononitrate

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

• isradipine

  Monitor Closely (2)ribociclib will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ribociclib increases toxicity of isradipine by QTc interval. Use Caution/Monitor.

• istradefylline

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

• itraconazole

  Monitor Closely (1)ribociclib will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (2)itraconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  itraconazole and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• ivacaftor

  Monitor Closely (1)ribociclib 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 moderate CYP3A4 inhibitors. See specific ivacaftor-containing product for precise dosage modification.

• ivosidenib

  Monitor Closely (1)ribociclib will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with moderate CYP3A4 inhibitors may increase ivosidenib plasma concentrations, thus increasing the risk of QTc prolongation. Monitor for increased risk of QTc interval prolongation.Serious - Use Alternative (1)ivosidenib and ribociclib 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.

• ixabepilone

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

• ixazomib

  Minor (1)ribociclib will increase the level or effect of ixazomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ketamine

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

• ketoconazole

  Serious - Use Alternative (3)ketoconazole increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.
  
  ketoconazole, ribociclib. Either increases effects of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of ketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• lacosamide

  Minor (1)ribociclib will increase the level or effect of lacosamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lansoprazole

  Minor (1)ribociclib will increase the level or effect of lansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lapatinib

  Monitor Closely (1)ribociclib will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of lapatinib by QTc interval. Avoid or Use Alternate Drug.

• larotrectinib

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

• lefamulin

  Contraindicated (1)lefamulin will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lefamulin is contraindicated with CYP3A substrates know to prolong the QT interval.Monitor Closely (1)ribociclib will increase the level or effect of lefamulin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for adverse effects if lefamulin is coadministered with moderate CYP3A inhibitors.

• lemborexant

  Serious - Use Alternative (1)ribociclib 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.

• lenacapavir

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

• letermovir

  Monitor Closely (2)letermovir increases levels of letrozole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  letermovir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levamlodipine

  Monitor Closely (1)ribociclib 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

  Serious - Use Alternative (1)ribociclib increases toxicity of levofloxacin by QTc interval. Avoid or Use Alternate Drug.

• levoketoconazole

  Serious - Use Alternative (3)levoketoconazole increases toxicity of ribociclib by QTc interval. Avoid or Use Alternate Drug.
  
  levoketoconazole, ribociclib. Either increases effects of the other by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib will increase the level or effect of levoketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• levomilnacipran

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

• levonorgestrel intrauterine

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

• levonorgestrel oral

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

• linagliptin

  Minor (1)ribociclib will increase the level or effect of linagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lithium

  Serious - Use Alternative (1)lithium and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• lofexidine

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

• lomitapide

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

• lonafarnib

  Contraindicated (1)ribociclib 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 (1)ribociclib will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (2)lopinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.
  
  ribociclib and lopinavir both increase QTc interval. Avoid or Use Alternate Drug.

• lorlatinib

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

• losartan

  Minor (1)ribociclib will increase the level or effect of losartan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lovastatin

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

• lumacaftor/ivacaftor

  Serious - Use Alternative (2)ribociclib will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  lumacaftor/ivacaftor will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• lumateperone

  Monitor Closely (1)ribociclib will increase the level or effect of lumateperone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce lumateperone dose to 21 mg/day if coadministered with moderate CYP3A4 inhibitors.

• lumefantrine

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

• lurasidone

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

• lurbinectedin

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

• macimorelin

  Serious - Use Alternative (1)macimorelin and ribociclib 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.Minor (1)ribociclib will increase the level or effect of macimorelin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• maprotiline

  Serious - Use Alternative (1)ribociclib increases toxicity of maprotiline by QTc interval. Avoid or Use Alternate Drug.

• maraviroc

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

• marijuana

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

• mavacamten

  Monitor Closely (2)ribociclib will increase the level or effect of mavacamten by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Inititiation of moderate CYP3A4 inhibitors may require decreased mavacamten dose.
  
  letrozole will increase the level or effect of mavacamten by affecting hepatic enzyme CYP2C19 metabolism. Modify Therapy/Monitor Closely. Inititiation of weak CYP2C19 inhibitors may require decreased mavacamten dose.

• medroxyprogesterone

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

• mefloquine

  Monitor Closely (1)ribociclib will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of mefloquine by QTc interval. Avoid or Use Alternate Drug.

• mestranol

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

• metaxalone

  Minor (1)ribociclib will increase the level or effect of metaxalone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methadone

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

• methylergonovine

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

• methylprednisolone

  Minor (1)ribociclib will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• miconazole oral

  Minor (1)ribociclib will increase the level or effect of miconazole oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midazolam

  Monitor Closely (1)ribociclib will increase the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• midazolam intranasal

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

• midostaurin

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

• mifepristone

  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.

• mirtazapine

  Monitor Closely (1)ribociclib will increase the level or effect of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)mirtazapine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• mitotane

  Serious - Use Alternative (1)mitotane will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• mobocertinib

  Serious - Use Alternative (2)ribociclib will increase the level or effect of mobocertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If use of moderate CYP3A4 inhibitor unavoidable, reduce mobocertinib dose by ~50% (eg, 160 to 80 mg); closely monitor QTc interval.
  
  mobocertinib and ribociclib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, reduce mobocertinib dose and monitor QTc interval more frequently.

• modafinil

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

• mometasone inhaled

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

• montelukast

  Minor (1)ribociclib will increase the level or effect of montelukast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• moxifloxacin

  Serious - Use Alternative (1)ribociclib and moxifloxacin both increase QTc interval. Avoid or Use Alternate Drug.

• nafcillin

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

• naldemedine

  Monitor Closely (1)ribociclib increases levels of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor naldemedine for potential adverse effects if coadministered with strong or moderate CYP3A4 inhibitors.

• naloxegol

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

• nefazodone

  Monitor Closely (1)ribociclib will increase the level or effect of nefazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)nefazodone will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• nelfinavir

  Monitor Closely (1)ribociclib will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)nelfinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• neratinib

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

• netupitant/palonosetron

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

• nevirapine

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

• nicardipine

  Monitor Closely (1)ribociclib will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.Serious - Use Alternative (1)nicardipine will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• nifedipine

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

• nilotinib

  Monitor Closely (1)ribociclib will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)ribociclib and nilotinib both increase QTc interval. Avoid or Use Alternate Drug.

• nimodipine

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

• nisoldipine

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

• norethindrone

  Minor (1)ribociclib will increase the level or effect of norethindrone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• norgestrel

  Minor (1)ribociclib will increase the level or effect of norgestrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nortriptyline

  Serious - Use Alternative (2)ribociclib will increase the level or effect of nortriptyline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of nortriptyline by QTc interval. Avoid or Use Alternate Drug.

• octreotide

  Serious - Use Alternative (1)ribociclib increases toxicity of octreotide by QTc interval. Avoid or Use Alternate Drug.

• ofatumumab SC

  Monitor Closely (1)ofatumumab SC, ribociclib. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Consider the risk of additive immune system effects when coadministering immunosuppressive therapies with coadministration. When switching from therapies with immune effects, take into account the duration and mechanism of action of these therapies when initiating ofatumumab SC.

• ofloxacin

  Serious - Use Alternative (1)ribociclib increases toxicity of ofloxacin by QTc interval. Avoid or Use Alternate Drug.

• olanzapine

  Serious - Use Alternative (1)ribociclib increases toxicity of olanzapine by QTc interval. Avoid or Use Alternate Drug. Limited data, including some case reports, suggest that olanzapine may be associated with a significant prolongation of the QTc interval in rare instances.

• olaparib

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

• oliceridine

  Monitor Closely (1)ribociclib 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.

• omaveloxolone

  Serious - Use Alternative (1)ribociclib will increase the level or effect of omaveloxolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unavoidable, reduce omaveloxolone dose to 100 mg/day. Closely monitor for adverse effects. If adverse effects emerge, further reduce to 50 mg/day.

• ombitasvir/paritaprevir/ritonavir

  Monitor Closely (1)ribociclib will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  Monitor Closely (1)ribociclib will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• omeprazole

  Minor (1)ribociclib will increase the level or effect of omeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ondansetron

  Monitor Closely (1)ribociclib will increase the level or effect of ondansetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and ondansetron both increase QTc interval. Avoid or Use Alternate Drug.

• osilodrostat

  Monitor Closely (2)osilodrostat and ribociclib both increase QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and osilodrostat both increase QTc interval. Avoid or Use Alternate Drug. Dose dependent QT prolongation - avoid drugs known to prolong the QT interval

• osimertinib

  Serious - Use Alternative (1)ribociclib increases toxicity of osimertinib by QTc interval. Avoid or Use Alternate Drug.Minor (1)ribociclib will increase the level or effect of osimertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ospemifene

  Monitor Closely (1)ribociclib 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 ribociclib by Other (see comment). Use Caution/Monitor. Monitor for ECG changes if therapy is initiated in patients with drugs known to prolong QT interval.Serious - Use Alternative (1)oxaliplatin and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• oxybutynin

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

• oxybutynin transdermal

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

• oxycodone

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

• ozanimod

  Monitor Closely (1)ozanimod and ribociclib 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)ribociclib will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• paclitaxel protein bound

  Monitor Closely (1)ribociclib will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• pacritinib

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

• palbociclib

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

• palifermin

  Serious - Use Alternative (1)palifermin increases toxicity of ribociclib by Other (see comment). Avoid or Use Alternate Drug. Comment: Palifermin should not be administered within 24 hr before, during infusion of, or within 24 hr after administration of antineoplastic agents. Coadministration of palifermin within 24 hr of chemotherapy resulted in increased severity and duration of oral mucositis.

• paliperidone

  Serious - Use Alternative (1)ribociclib and paliperidone both increase QTc interval. Avoid or Use Alternate Drug.

• panobinostat

  Monitor Closely (1)ribociclib will increase the level or effect of panobinostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of panobinostat by QTc interval. Avoid or Use Alternate Drug.

• paricalcitol

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

• pasireotide

  Serious - Use Alternative (1)ribociclib increases toxicity of pasireotide by QTc interval. Avoid or Use Alternate Drug.

• pazopanib

  Monitor Closely (1)ribociclib will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of pazopanib by QTc interval. Avoid or Use Alternate Drug.

• pemigatinib

  Serious - Use Alternative (1)ribociclib 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

  Serious - Use Alternative (1)ribociclib increases toxicity of pentamidine by QTc interval. Avoid or Use Alternate Drug.

• perampanel

  Minor (1)ribociclib will increase the level or effect of perampanel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• perphenazine

  Serious - Use Alternative (1)ribociclib increases toxicity of perphenazine by QTc interval. Avoid or Use Alternate Drug.

• pexidartinib

  Serious - Use Alternative (1)ribociclib 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.

• phenobarbital

  Serious - Use Alternative (1)phenobarbital will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• phenytoin

  Serious - Use Alternative (1)phenytoin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• pimavanserin

  Monitor Closely (1)ribociclib will increase the level or effect of pimavanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and pimavanserin both increase QTc interval. Avoid or Use Alternate Drug.

• pimozide

  Serious - Use Alternative (2)ribociclib will increase the level or effect of pimozide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.
  
  ribociclib and pimozide both increase QTc interval. Avoid or Use Alternate Drug.

• pitolisant

  Serious - Use Alternative (1)ribociclib and pitolisant both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)ribociclib will increase the level or effect of pitolisant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• polatuzumab vedotin

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

• pomalidomide

  Minor (1)ribociclib will increase the level or effect of pomalidomide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ponatinib

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

• posaconazole

  Contraindicated (1)ribociclib increases toxicity of posaconazole by QTc interval. Contraindicated.Serious - Use Alternative (1)posaconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• praziquantel

  Minor (1)ribociclib will increase the level or effect of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• primaquine

  Serious - Use Alternative (1)primaquine and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.Minor (1)ribociclib will increase the level or effect of primaquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• primidone

  Serious - Use Alternative (1)primidone will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• procainamide

  Serious - Use Alternative (1)ribociclib and procainamide both increase QTc interval. Avoid or Use Alternate Drug.

• progesterone intravaginal gel

  Minor (1)ribociclib will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone micronized

  Minor (1)ribociclib will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone, natural

  Minor (1)ribociclib will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• propafenone

  Serious - Use Alternative (2)ribociclib will increase the level or effect of propafenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of propafenone by QTc interval. Avoid or Use Alternate Drug.

• protriptyline

  Serious - Use Alternative (1)ribociclib increases toxicity of protriptyline by QTc interval. Avoid or Use Alternate Drug.

• quazepam

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

• quetiapine

  Monitor Closely (1)ribociclib will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib and quetiapine both increase QTc interval. Avoid or Use Alternate Drug.

• quinidine

  Monitor Closely (1)ribociclib will increase the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.Serious - Use Alternative (1)ribociclib and quinidine both increase QTc interval. Avoid or Use Alternate Drug.

• quinine

  Monitor Closely (1)ribociclib will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.Serious - Use Alternative (1)ribociclib increases toxicity of quinine by QTc interval. Avoid or Use Alternate Drug.

• rabeprazole

  Minor (1)ribociclib will increase the level or effect of rabeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ramelteon

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

• ranolazine

  Contraindicated (1)ribociclib increases toxicity of ranolazine by QTc interval. Contraindicated.Monitor Closely (1)ribociclib will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• regorafenib

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

• repaglinide

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

• rifabutin

  Monitor Closely (2)rifabutin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rifampin

  Serious - Use Alternative (1)rifampin will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• rifapentine

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

• rilpivirine

  Serious - Use Alternative (1)ribociclib increases toxicity of rilpivirine by QTc interval. Avoid or Use Alternate Drug.

• rimegepant

  Monitor Closely (1)ribociclib will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid repeating rimegepant dose within 48 hr if coadministered with a moderate CYP3A4 inhibitor.

• riociguat

  Minor (1)ribociclib will increase the level or effect of riociguat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• risperidone

  Serious - Use Alternative (1)ribociclib increases toxicity of risperidone by QTc interval. Avoid or Use Alternate Drug.

• ritonavir

  Monitor Closely (1)ribociclib will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Serious - Use Alternative (1)ritonavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• rivaroxaban

  Minor (1)ribociclib will increase the level or effect of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• roflumilast

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

• rolapitant

  Minor (1)ribociclib will increase the level or effect of rolapitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• romidepsin

  Serious - Use Alternative (2)ribociclib increases toxicity of romidepsin by QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ropivacaine

  Minor (1)ribociclib will increase the level or effect of ropivacaine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rucaparib

  Monitor Closely (1)rucaparib will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• ruxolitinib

  Minor (1)ribociclib will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib topical

  Minor (1)ribociclib will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• salmeterol

  Minor (1)ribociclib will increase the level or effect of salmeterol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• saquinavir

  Contraindicated (1)ribociclib increases toxicity of saquinavir by QTc interval. Contraindicated.Serious - Use Alternative (2)ribociclib will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.
  
  saquinavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a strong CYP3A inhibitor must be coadministered with ribociclib, reduce the ribociclib starting dose to 400 mg/day.

• saxagliptin

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

• selpercatinib

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

• selumetinib

  Serious - Use Alternative (1)ribociclib 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

  Serious - Use Alternative (1)ribociclib increases toxicity of sertraline by QTc interval. Avoid or Use Alternate Drug.

• sevoflurane

  Serious - Use Alternative (1)sevoflurane and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• sildenafil

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

• silodosin

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

• simvastatin

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

• siponimod

  Monitor Closely (2)siponimod and letrozole both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.
  
  siponimod and ribociclib both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.Serious - Use Alternative (2)ribociclib 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.
  
  siponimod and ribociclib both increase QTc interval. Avoid or Use Alternate Drug.

• sirolimus

  Monitor Closely (1)ribociclib will increase the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• sodium sulfate/?magnesium sulfate/potassium chloride

  Monitor Closely (1)sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of ribociclib by QTc interval. Use Caution/Monitor. Consider predose and post-colonoscopy ECGs in patients at increased risk of serious cardiac arrhythmias. .

• sodium sulfate/potassium sulfate/magnesium sulfate

  Monitor Closely (1)sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of ribociclib by QTc interval. Use Caution/Monitor. Consider predose and post-colonoscopy ECGs in patients at increased risk of serious cardiac arrhythmias. .

• sofosbuvir/velpatasvir

  Minor (1)ribociclib will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• solifenacin

  Monitor Closely (1)ribociclib will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of solifenacin by QTc interval. Avoid or Use Alternate Drug.

• sonidegib

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

• sorafenib

  Serious - Use Alternative (2)ribociclib will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of sorafenib by QTc interval. Avoid or Use Alternate Drug.

• sotalol

  Serious - Use Alternative (1)ribociclib and sotalol both increase QTc interval. Avoid or Use Alternate Drug.

• sparsentan

  Monitor Closely (1)ribociclib will increase the level or effect of sparsentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No dosage adjustment needed. Monitor blood pressure, serum potassium, edema, and kidney function regularly if sparsentan is coadministered with moderate CYP3A4 inhibitors.

• St John's Wort

  Serious - Use Alternative (1)St John's Wort will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of ribociclib with strong CYP3A inducers should be avoided.

• stiripentol

  Monitor Closely (2)stiripentol, ribociclib. 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.
  
  ribociclib will increase the level or effect of stiripentol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• sufentanil

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

• sufentanil SL

  Monitor Closely (1)ribociclib 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 (1)ribociclib will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib increases toxicity of sunitinib by QTc interval. Avoid or Use Alternate Drug.

• suvorexant

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

• tacrolimus

  Monitor Closely (1)ribociclib will increase the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.Serious - Use Alternative (1)ribociclib increases toxicity of tacrolimus by QTc interval. Avoid or Use Alternate Drug.

• tadalafil

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

• tamoxifen

  Serious - Use Alternative (2)ribociclib increases levels of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Concurrent use of ribociclib and tamoxifen is not indicated. Coadministration shown to increase tamoxifen AUC and Cmax. May increase risk of adverse effects.
  
  tamoxifen decreases levels of letrozole by unspecified interaction mechanism. Contraindicated. Letrozole should not be given concurrently with tamoxifen. Letrozole therapy after the completion of standard tamoxifen treatment is not associated with impaired effects of letrozole.

• tamsulosin

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

• tasimelteon

  Minor (1)ribociclib will increase the level or effect of tasimelteon by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tazemetostat

  Monitor Closely (1)tazemetostat will decrease the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib 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 moderate CYP3A4 inhibitors. If coadministration is unavoidable, reduce tazemetostat current dose (see drug monograph Dosage Modifications).

• tecovirimat

  Monitor Closely (1)tecovirimat will decrease the level or effect of ribociclib 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

  Serious - Use Alternative (1)ribociclib increases toxicity of telavancin by QTc interval. Avoid or Use Alternate Drug.

• temsirolimus

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

• teniposide

  Minor (1)ribociclib will increase the level or effect of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tetrabenazine

  Serious - Use Alternative (1)ribociclib and tetrabenazine both increase QTc interval. Avoid or Use Alternate Drug.

• tezacaftor

  Monitor Closely (1)ribociclib will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust tezacaftor dosage regimen if coadministered with a moderate CYP3A inhibitor.

• theophylline

  Minor (1)ribociclib will increase the level or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• thioridazine

  Serious - Use Alternative (1)ribociclib and thioridazine both increase QTc interval. Avoid or Use Alternate Drug.

• tiagabine

  Minor (1)ribociclib will increase the level or effect of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ticagrelor

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

• ticlopidine

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

• tinidazole

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

• tipranavir

  Serious - Use Alternative (2)ribociclib will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated.
  
  tipranavir will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Inform patients to avoid pomegranate or pomegranate juice, and grapefruit or grapefruit juice

• tofacitinib

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

• tolterodine

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

• tolvaptan

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

• toremifene

  Serious - Use Alternative (2)ribociclib will increase the level or effect of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and toremifene both increase QTc interval. Avoid or Use Alternate Drug.

• trabectedin

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

• tramadol

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

• trastuzumab

  Monitor Closely (1)trastuzumab, ribociclib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy.

• trastuzumab deruxtecan

  Monitor Closely (1)trastuzumab deruxtecan, ribociclib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy.

• trazodone

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

• triazolam

  Monitor Closely (1)ribociclib will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Caution if ribociclib is coadministered with sensitive CYP3A4 substrates that have a narrow therapeutic index. Dose reduction for sensitive CYP3A4 substrates may be needed.

• triclabendazole

  Monitor Closely (1)triclabendazole and ribociclib both increase QTc interval. Use Caution/Monitor.

• trimethoprim

  Minor (1)ribociclib will increase the level or effect of trimethoprim by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trimipramine

  Serious - Use Alternative (2)ribociclib will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib increases toxicity of trimipramine by QTc interval. Avoid or Use Alternate Drug.

• tucatinib

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

• ulipristal

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

• umeclidinium bromide/vilanterol inhaled

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

• upadacitinib

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

• valbenazine

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

• vandetanib

  Serious - Use Alternative (2)ribociclib and vandetanib both increase QTc interval. Avoid or Use Alternate Drug.
  
  ribociclib will increase the level or effect of vandetanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vardenafil

  Monitor Closely (1)ribociclib will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors Serious - Use Alternative (1)ribociclib increases toxicity of vardenafil by QTc interval. Avoid or Use Alternate Drug.

• velpatasvir

  Minor (1)ribociclib will increase the level or effect of velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vemurafenib

  Serious - Use Alternative (2)ribociclib will increase the level or effect of vemurafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  ribociclib and vemurafenib both increase QTc interval. Avoid or Use Alternate Drug.

• venetoclax

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

• venlafaxine

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

• verapamil

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

• vilanterol/fluticasone furoate inhaled

  Monitor Closely (1)ribociclib increases toxicity of vilanterol/fluticasone furoate inhaled by QTc interval. Use Caution/Monitor.Serious - Use Alternative (1)ribociclib will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vilazodone

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

• vinblastine

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

• vincristine

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

• vincristine liposomal

  Minor (1)ribociclib will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vinorelbine

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

• voclosporin

  Monitor Closely (2)voclosporin, ribociclib. Either increases effects of the other by QTc interval. Use Caution/Monitor.
  
  ribociclib will increase the level or effect of voclosporin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce voclosporin daily dosage to 15.8 mg PO in AM and 7.9 mg PO in PM.

• vorapaxar

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

• voriconazole

  Serious - Use Alternative (3)ribociclib increases toxicity of voriconazole by QTc interval. Avoid or Use Alternate Drug.
  
  voriconazole will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Inform patients to avoid pomegranate or pomegranate juice, and grapefruit or grapefruit juice
  
  ribociclib will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• vorinostat

  Serious - Use Alternative (1)ribociclib increases toxicity of vorinostat by QTc interval. Avoid or Use Alternate Drug.

• vortioxetine

  Minor (1)ribociclib will increase the level or effect of vortioxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voxelotor

  Serious - Use Alternative (1)voxelotor will increase the level or effect of ribociclib 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.

• voxilaprevir

  Minor (1)ribociclib will increase the level or effect of voxilaprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zaleplon

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

• zanubrutinib

  Monitor Closely (1)ribociclib will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib (a CYP3A4 substrate) to 80 mg PO BID to when coadministered with a moderate CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib.

• ziprasidone

  Serious - Use Alternative (1)ribociclib and ziprasidone both increase QTc interval. Avoid or Use Alternate Drug.

• zolpidem

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

• zonisamide

  Minor (1)ribociclib will increase the level or effect of zonisamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.