crizotinib (Rx)

Non-Small Cell Lung Cancer

Indicated for metastatic non-small cell lung cancer (NSCLC) in adults whose tumors are anaplastic lymphoma kinase (ALK)- or ROS1-positive

250 mg PO BID

Continue until disease progression or unacceptable toxicity

Inflammatory Myofibroblastic tumors

Indicated for unresectable, recurrent, or refractory inflammatory myofibroblastic tumors (IMT) in adults who are ALK-positive

250 mg PO BID

Continue until disease progression or unacceptable toxicity

Dosage Modifications

Dosage reductions

• First dose reduction: 200 mg PO BID
• Second dose reduction: 250 mg PO qDay
• Unable to tolerate 250 mg PO qDay: Permanently discontinue

Hematologic toxicities

• For all hematologic toxicities except lymphopenia (unless associated with clinical events, eg, opportunistic infections)
• Grade 3: Withhold until recovery to Grade ≤2, then resume at same dose
• Grade 4: Withhold until recovery to Grade ≤2, then resume at next dose reduction

Hepatotoxicity

• ALT or AST >5x ULN with total bilirubin [TB] ≤1.5x ULN: Withhold until recovery to baseline or ≤3x ULN, then resume at next dose reduction
• ALT or AST >3x with concurrent TB >1.5x ULN (in the absence of cholestasis or hemolysis): Permanently discontinue

Interstitial lung disease

• Any grade pneumonitis: Permanently discontinue

QT prolongation

• Correct QT (QTc) >500 ms on at least 2 separate electrocardiograms (ECGs): Withhold until recovery to baseline or at QTc <481 ms, then resume at next dose reduction
• QTc >500 ms or ≥60 ms change from baseline with Torsade de pointes or polymorphic ventricular tachycardia or signs/symptoms of serious arrhythmia: Permanently discontinue

Bradycardia

Symptomatic, may be severe and medically intervention indicated

• Withhold until recovery to asymptomatic bradycardia or HR ≥60 bpm
• Evaluate concomitant medications known to cause bradycardia (eg, antihypertensives)
• Discontinue or adjust dose of any contributing medication; resume at previous dose upon recovery to asymptomatic bradycardia or HR ≥60 bpm
• Contributing medication not identified, or if contributing medications not discontinue or dose modified: Resume at next dose reduction upon recovery to asymptomatic bradycardia or to a HR ≥60 bpm

Life-threatening consequences, urgent intervention indicated

• No contributing medications identified: Permanently discontinue
• If contributing medication identified AND discontinued, or its dose adjusted: Resume at 250 mg qDay upon recovery to asymptomatic bradycardia or to a HR ≥60 bpm, closely monitor
• Permanently discontinue for recurrence

Visual loss

• Grade 4 ocular disorder: Discontinue during evaluation of severe visual loss

Strong CYP3A4 inhibitors

• Avoid coadministration
• If use is unavoidable, reduce crizotinib dose to 250 mg PO qDay
• After discontinuation of strong CYP3A inhibitor, resume crizotinib dose used before initiating strong CYP3A inhibitor

Renal impairment

• Mild-to-moderate (CrCl 30-89 mL/min): No dosage adjustment necessary
• Severe (CrCl <30 mL/min) and not requiring dialysis: 250 mg PO qDay

Hepatic impairment

• Mild (AST >ULN and TB ≤1x ULN or any AST and TB >1x to ≤1.5x ULN): Steady-state mean AUC and Cmax decreased by 9%
• Moderate (any AST and TB >1.5x ULN and ≤3x ULN): 200 mg PO BID
• Severe (any AST and TB>3x ULN): 250 mg PO qDay

Dosing Considerations

Verify pregnancy status in females of reproductive potential before initiation

Monitoring parameters

• CBC including differential WBC counts: Monthly and as clinically indicated, more frequently test if Grade 3 or 4 abnormalities are observed or if fever or infection occurs
• Liver function tests: Every 2 weeks during the first 2 months of treatment, then monthly, and as clinically needed

Limitation of use

• Safety and efficacy not established in adults with relapsed or refractory, systemic ALK-positive ALCL

Patient selection

• Select based presence of ALK- or ROS1- positive tumor specimens
• Information is available at http://www.fda.gov/companiondiagnostics

Anaplastic Large Cell Lymphoma

Indicated for relapsed or refractory, systemic ALK-positive anaplastic large cell lymphoma (ALCL) in children and young adults aged ≥1 year

Assess the ability to swallow intact capsules before prescribing

280 mg/m² PO BID

Continue until disease progression or unacceptable toxicity

Recommended dosage based on BSA

<0.6 m²: Dose not established

0.6-0.8 m²: 200 mg PO BID

0.81-1.16 m²: 250 mg PO BID

1.17-1.51 m²: 400 mg PO BID

1.52-1.69 m²: 450 mg PO BID

≥1.70 m²: 500 mg PO BID

Inflammatory Myofibroblastic Tumors

Indicated for unresectable, recurrent, or refractory inflammatory myofibroblastic tumors (IMT) in adults and pediatric patients aged ≥1 year who are ALK-positive

<1 year: Safety and efficacy not established

≥1 year

• 280 mg/m² PO BID

• Recommended dosage based on body surface area (BSA)

  • <0.60 m²: Safety and efficacy not established
  • 0.6-0.8 m²: 200 mg PO BID
  • 0.81-1.16 m²: 250 mg PO BID
  • 1.17-1.51 m²: 400 mg PO BID
  • 1.52-1.69 m²: 450 mg PO BID
  • ≥1.70 m²: 500 mg PO BID
  • Continue until disease progression or unacceptable toxicity

Dosage Modifications

Premedication for ALCL or IMT

• Provide standard antiemetic and antidiarrheal agents
• Antiemetics are recommended before and during treatment
• Consider IV or oral hydration for patients at risk of dehydration, and replace electrolytes as clinically indicated

Dose reductions based on BSA

• First dose reduction

  • 0.6-0.8 m²: 250 mg PO qDay
  • 0.81-1.16 m²: 200 mg PO BID
  • 1.17-1.69 m²: 250 mg PO BID
  • ≥1.70 m²: 400 mg PO BID

• Second dose reduction

  • 0.6-0.8 m²: Permanently discontinue
  • 0.81-1.16 m²: 250 mg PO qDay
  • 1.17-1.69 m²: 200 mg PO BID
  • ≥1.70 m²: 250 mg PO BID

• Unable to tolerate after 2 dose reductions

  • Permanently discontinue

Absolute neutrophil count (ANC)

• ANC <0.5 x 10⁹/L

• First occurrence

  • Withhold until recovery to ANC >1 x 10⁹/L, then resume at next dose reduction

• Second occurrence

  • Recurrence complicated by febrile neutropenia: Permanently discontinue
  • Uncomplicated Grade 4: Either permanently discontinue or withhold until recovery to ANC >1 x 10⁹/L, then resume at next dose reduction
  • Unable to tolerate 2 dose reductions: Permanently discontinue

Platelet count

• 25-50 x 10⁹/L with concurrent bleeding: Withhold until recovery to platelet count >50 x 10⁹/L and bleeding resolves, then resume at same dose
• <25 x 10⁹/L: Withhold until recovery to platelet count >50 x 10⁹/L and bleeding resolves, then resume at next dose reduction
• Permanently discontinue for recurrence

Anemia

• Hemoglobin (Hgb) <8 g/dL: Withhold until recovery to Hgb >8 g/dL, then resume at same dose
• Life-threatening anemia (urgent intervention indicated): Withhold until recovery to Hgb >8 g/dL, then resume at next dose reduction
• Permanently discontinue for recurrence

Hepatotoxicity

• ALT or AST >5x ULN with total bilirubin [TB] ≤1.5x ULN: Withhold until recovery to baseline or ≤3x ULN, then resume at next dose reduction
• ALT or AST >3x AND TB >1.5x ULN (in the absence of cholestasis or hemolysis): Permanently discontinue

Interstitial lung disease/pneumonitis

• Any grade (drug-related): Permanently discontinue

QT prolongation

• Correct QT (QTc) >500 ms on at least 2 separate ECG: Withhold until recovery to baseline or at QTc <481 ms, then resume at next dose reduction
• QTc >500 ms or ≥60 ms change from baseline with torsade de pointes or polymorphic ventricular tachycardia or signs/symptoms of serious arrhythmia: Permanently discontinue

Bradycardia

• Resting HR <2.5th percentile per age-specific norms

  • 1 to <2 years: ≥91 bpm
  • 2-3 years: ≥82 bpm
  • 4-5 years: ≥72 bpm
  • 6-8 years: ≥64 bpm
  • >8 years: ≥60 bpm

• Symptomatic, may be severe and medically intervention indicated

  • Withhold until recovery to resting HR according to age (based on 2.5^th percentile per age-specific norms)

• Life-threatening consequences (urgent intervention indicated)

• No contributing medications identified: Permanently discontinue
• If contributing medication is identified, and discontinued, or its dose adjusted: Resume at second dose reduction upon recovery to asymptomatic bradycardia or manage HR based on criteria of symptomatic or severe, medically significant bradycardia, with frequent monitoring
• Permanently discontinue for recurrence

Ocular toxicity

• Grade 1 or 2 (mild or moderate visual symptoms affecting ability to perform age-appropriate activities of daily living)

  • Monitor and report any symptoms to an eye specialist
  • Grade 2 visual disorders: Consider dose reduction

• Grade 3 or 4 ocular disorder (marked decrease in vision)

  • Withhold pending evaluation of severe visual loss
  • Permanently discontinue, if no other cause found on evaluation

Gastrointestinal toxicity

• Occurs despite maximum medical therapy
• Grade 3 nausea (inadequate oral intake for >3 days, medical intervention required)
• Grade 3 vomiting (> 6 episodes in 24 hr for >3 days, medical intervention required [eg, tube feeding or hospitalization)
• Grade 3 diarrhea (increase of ≥7 stools/day over baseline; incontinence; hospitalization indicated)
• Grade 4 vomiting or diarrhea (life-threatening consequences, urgent intervention indicated)
• Withhold until resolved for any of of above descriptions, then resume at next dose reduction
• Permanently discontinue if unable to tolerate after 2 dose reductions, unless otherwise indicated

Strong CYP3A4 inhibitors

• Avoid coadministration
• If use is unavoidable, reduce criztotinib dose to second dose reduction
• After discontinuation of strong CYP3A inhibitor, resume crizotinib dose used before initiating strong CYP3A inhibitor

Renal impairment

• Calculate CrCl with Schwartz equation
• Mild-to-moderate (CrCl 30-89 mL/min): No dosage adjustment necessary
• Severe (CrCl <30 mL/min) and not requiring dialysis: Second dose reduction

Hepatic impairment

• Moderate (any AST and TB >1.5x ULN and ≤3x ULN): First dose reduction
• Severe (any AST and TB >3x ULN): Second dose reduction

Dosing Considerations

Verify pregnancy status in females of reproductive potential before initiation

Monitoring parameters

• CBC including differential WBC counts: Monthly and as clinically indicated, more frequently if Grade 3 or 4 abnormalities are observed or if fever or infection occurs
• Ophthalmologic examination: Obtain at baseline before initiation; consider follow-up including retinal examination within 1 month of initiation, every 3 months thereafter, and upon any new visual symptoms; assess symptoms regularly during treatment
• Liver function tests: Every 2 weeks during the first 2 months of treatment, then monthly, and as clinically needed

Supportive care

• Provide standard antiemetic and antidiarrheal agents before and during treatment
• Consider IV or oral hydration and replace electrolytes as clinically indicated

Limitation of use

• Safety and efficacy not established in older adults with relapsed or refractory, systemic ALK-positive ALCL

No overall differences in safety or efficacy were observed in comparison with younger patients

Contraindicated (9)

• dronedarone

  crizotinib and dronedarone both increase QTc interval. Contraindicated. Dronedarone is contraindicated with drugs that may prolong the QT interval. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• flibanserin

  crizotinib will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Coadministration of flibanserin with moderate or strong CYP3A4 inhibitors is contraindicated. Severe hypotension or syncope can occur.

• lefamulin

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

• lomitapide

  crizotinib increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Increases lomitapide levels several folds.

• lonafarnib

  crizotinib 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.

• pimozide

  crizotinib and pimozide both increase QTc interval. Contraindicated. Pimozide is contraindicated with drugs that may prolong the QT interval. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• posaconazole

  crizotinib and posaconazole both increase QTc interval. Contraindicated.

• saquinavir

  crizotinib and saquinavir both increase QTc interval. Contraindicated.

• thioridazine

  crizotinib and thioridazine both increase QTc interval. Contraindicated. Thioridazine is contraindicated with drugs that may prolong the QT interval.

Serious - Use Alternative (121)

• abametapir

  abametapir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.

• alfuzosin

  alfuzosin and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• amiodarone

  crizotinib and amiodarone both increase QTc interval. Avoid or Use Alternate Drug.

• amisulpride

  crizotinib and amisulpride both increase QTc interval. Avoid or Use Alternate Drug. ECG monitoring is recommended if coadministered.

• anagrelide

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

• apalutamide

  apalutamide will decrease the level or effect of crizotinib 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.

• aripiprazole

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

• artemether

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

• atomoxetine

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

• avapritinib

  crizotinib 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.

• bosutinib

  crizotinib increases levels of bosutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• buprenorphine

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

• ceritinib

  ceritinib and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• chloramphenicol

  chloramphenicol will increase the level or effect of crizotinib by aldehyde dehydrogenase inhibition. Avoid or Use Alternate Drug.

• citalopram

  citalopram and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• clarithromycin

  clarithromycin and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• clozapine

  clozapine and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• cobicistat

  cobicistat 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; May reduce crizotinib dose to 250 mg PO qDay if concomitant administration cannot be avoided.

• cobimetinib

  crizotinib will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concurrent short term (14 days or less) use of moderate CYP3A inhibitors is unavoidable for patients who are taking cobimetinib 60 mg, reduce the cobimetinib dose to 20 mg. After discontinuation of a moderate CYP3A inhibitor, resume cobimetinib 60 mg. Use an alternative to a moderate CYP3A inhibitor in patients who are taking a reduced dose of cobimetinib (40 or 20 mg daily).

• conivaptan

  conivaptan 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

• dasatinib

  crizotinib and dasatinib both increase QTc interval. Avoid or Use Alternate Drug.

• desflurane

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

• disopyramide

  crizotinib increases levels of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and disopyramide both increase QTc interval. Avoid or Use Alternate Drug.

• donepezil

  donepezil and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• edoxaban

  crizotinib will increase the level or effect of edoxaban by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Dose adjustment may be required with strong P-gp inhibitors. DVT/PE treatment: Decrease dose to 30 mg PO once daily. NVAF: No dose reduction recommended

• efavirenz

  efavirenz and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• eliglustat

  crizotinib increases levels of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Moderate CYP3A4 inhibitors are not recommended with eliglustat poor or intermediate metabolizers; reduce eliglustat dose from 84 mg BID to 84 mg once daily in extensive metabolizers .
  
  crizotinib and eliglustat both increase QTc interval. Avoid or Use Alternate Drug.

• encorafenib

  crizotinib 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.
  
  crizotinib and encorafenib both increase QTc interval. Avoid or Use Alternate Drug.

• entrectinib

  crizotinib and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  crizotinib 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.

• erdafitinib

  erdafitinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If coadministration unavoidable, separate administration by at least 6 hr before or after administration of P-gp substrates with narrow therapeutic index.

• eribulin

  crizotinib and eribulin both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin base

  crizotinib and erythromycin base both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  crizotinib and erythromycin ethylsuccinate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  crizotinib and erythromycin lactobionate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  crizotinib and erythromycin stearate both increase QTc interval. Avoid or Use Alternate Drug.

• escitalopram

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

• eslicarbazepine acetate

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

• fentanyl

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

• fentanyl intranasal

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

• fentanyl transdermal

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

• fentanyl transmucosal

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

• fexinidazole

  fexinidazole and crizotinib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels or prolong QT interval.
  
  fexinidazole will increase the level or effect of crizotinib 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

  fingolimod and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• gilteritinib

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

• glasdegib

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

• granisetron

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

• haloperidol

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

• hydroxychloroquine sulfate

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

• hydroxyzine

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

• idelalisib

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

• indacaterol, inhaled

  crizotinib and indacaterol, inhaled both increase QTc interval. Avoid or Use Alternate Drug.

• infigratinib

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

• inotuzumab

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

• irinotecan

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

• irinotecan liposomal

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

• isoflurane

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

• itraconazole

  itraconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If combination cannot be avoided, decrease crizotinib dose to 250 mg daily. Monitor for increased crizotinib toxicities, including QTc interval prolongation and ventricular arrhythmias. .
  
  crizotinib and itraconazole both increase QTc interval. Avoid or Use Alternate Drug.

• ivabradine

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

• ivosidenib

  ivosidenib and crizotinib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of QTc prolonging drugs with ivosidenib or replace with alternate therapies. If coadministration of a QTc prolonging drug is unavoidable, monitor for increased risk of QTc interval prolongation.
  
  ivosidenib will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternate therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• ketoconazole

  ketoconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. See prescribing information for precise dosage modification.

• lasmiditan

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

• lefamulin

  crizotinib and lefamulin both increase QTc interval. Avoid or Use Alternate Drug.

• lemborexant

  crizotinib 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.

• levoketoconazole

  levoketoconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. See prescribing information for precise dosage modification.

• lithium

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

• lofexidine

  crizotinib and lofexidine both increase QTc interval. Avoid or Use Alternate Drug.

• loperamide

  crizotinib and loperamide both increase QTc interval. Avoid or Use Alternate Drug.

• lopinavir

  crizotinib and lopinavir both increase QTc interval. Avoid or Use Alternate Drug.

• lurbinectedin

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

• macimorelin

  macimorelin and crizotinib 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.

• mefloquine

  crizotinib and mefloquine both increase QTc interval. Avoid or Use Alternate Drug.

• methadone

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

• midazolam intranasal

  crizotinib 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

  crizotinib and midostaurin both increase QTc interval. Avoid or Use Alternate Drug.

• mifepristone

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

• mirtazapine

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

• mobocertinib

  crizotinib 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 crizotinib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, reduce mobocertinib dose and monitor QTc interval more frequently.

• naloxegol

  crizotinib will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministation of naloxegol with moderate CYP3A4 inhibitors is unavoidable, reduce naloxegol dose to 12.5 mg qDay

• neratinib

  crizotinib 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

• nilotinib

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

• olanzapine

  crizotinib and olanzapine both increase 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

  crizotinib will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with moderate CYP3A inhibitors cannot be avoided, reduce olaparib dose to 200 mg (capsule) or 150 mg (tablet) PO BID. Do not substitute tablets with capsules.

• ondansetron

  crizotinib and ondansetron both decrease QTc interval. Avoid or Use Alternate Drug. Avoid with congenital long QT syndrome; ECG monitoring recommended with concomitant medications that prolong QT interval, electrolyte abnormalities, CHF, or bradyarrhythmias.

• oxaliplatin

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

• pacritinib

  crizotinib 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 crizotinib 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.

• panobinostat

  crizotinib and panobinostat both increase QTc interval. Avoid or Use Alternate Drug. Panobinostat is known to significantly prolong QT interval. Panobinostat prescribing information states use with drugs known to prolong QTc is not recommended.

• pazopanib

  crizotinib and pazopanib both increase QTc interval. Avoid or Use Alternate Drug.

• pemigatinib

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

• pexidartinib

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

• pimavanserin

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

• pitolisant

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

• ponesimod

  ponesimod, crizotinib. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Consult cardiologist if considering treatment. Coadministration of ponesimod with drugs that decrease HR may have additive effects on decreasing HR and should generally not be initiated in these patients.
  
  crizotinib and ponesimod both increase QTc interval. Avoid or Use Alternate Drug.

• primaquine

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

• primidone

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

• quetiapine

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

• quinidine

  crizotinib increases levels of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and quinidine both increase QTc interval. Avoid or Use Alternate Drug.

• ranolazine

  crizotinib and ranolazine both increase QTc interval. Avoid or Use Alternate Drug.

• ribociclib

  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.

• selumetinib

  crizotinib 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

  crizotinib and sertraline both increase QTc interval. Avoid or Use Alternate Drug.

• sevoflurane

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

• sildenafil

  crizotinib increases levels of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid use of strong CYP3A4 inhibitors. If concomitant use of strong CYP3A inhibitors is unavoidable, reduce crizotnib to 250 mg PO qDay. After discontinuation of a strong CYP3A inhibitor, resume crizotinib dose used prior to initiating the strong CYP3A4 inhibitor.

• siponimod

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

• solifenacin

  crizotinib and solifenacin both increase QTc interval. Avoid or Use Alternate Drug.

• sotorasib

  sotorasib will decrease the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If use is unavoidable, refer to the prescribing information of the P-gp substrate for dosage modifications.

• sunitinib

  crizotinib and sunitinib both increase QTc interval. Avoid or Use Alternate Drug.

• tacrolimus

  crizotinib increases levels of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and tacrolimus both increase QTc interval. Avoid or Use Alternate Drug.

• tazemetostat

  crizotinib 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).

• tepotinib

  tepotinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If concomitant use unavoidable, reduce the P-gp substrate dosage if recommended in its approved product labeling.

• tetrabenazine

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

• topotecan

  crizotinib will increase the level or effect of topotecan by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Product labeling for PO topotecan recommends avoiding concomitant use of P-gp inhibitors; the interaction with IV topotecan may be less severe but is still likely of clinical significance

• trazodone

  crizotinib and trazodone both increase QTc interval. Avoid or Use Alternate Drug.

• triclabendazole

  crizotinib and triclabendazole both increase QTc interval. Avoid or Use Alternate Drug.

• tucatinib

  tucatinib will increase the level or effect of crizotinib 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.

• umeclidinium bromide/vilanterol inhaled

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

• vardenafil

  crizotinib and vardenafil both increase QTc interval. Avoid or Use Alternate Drug.

• venetoclax

  crizotinib will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a moderate CYP3A inhibitor must be used, reduce the venetoclax dose by at least 50%. Monitor more closely for signs of venetoclax toxicities.
  
  crizotinib will increase the level or effect of venetoclax by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If a P-gp inhibitor must be used, reduce the venetoclax dose by at least 50%. Monitor more closely for signs of venetoclax toxicities.

• vilanterol/fluticasone furoate inhaled

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

• voriconazole

  crizotinib and voriconazole both increase QTc interval. Avoid or Use Alternate Drug.

• voxelotor

  voxelotor will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

Monitor Closely (308)

• abiraterone

  abiraterone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• acalabrutinib

  crizotinib 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.

• albuterol

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

• alfentanil

  crizotinib increases levels of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• alfuzosin

  crizotinib increases levels of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib and alfuzosin both increase QTc interval. Use Caution/Monitor.

• aliskiren

  crizotinib increases levels of aliskiren by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• alprazolam

  crizotinib increases levels of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• aluminum hydroxide

  aluminum hydroxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• amiodarone

  crizotinib increases levels of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  amiodarone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• amitriptyline

  crizotinib and amitriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• amlodipine

  crizotinib increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• amoxapine

  crizotinib and amoxapine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• apomorphine

  crizotinib and apomorphine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• aprepitant

  aprepitant increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .
  
  crizotinib increases levels of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• arformoterol

  arformoterol and crizotinib both increase QTc interval. Use Caution/Monitor.

• aripiprazole

  crizotinib increases levels of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• armodafinil

  crizotinib increases levels of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• arsenic trioxide

  crizotinib and arsenic trioxide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• artemether/lumefantrine

  crizotinib and artemether/lumefantrine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• asenapine

  crizotinib and asenapine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• asenapine transdermal

  asenapine transdermal and crizotinib both increase QTc interval. Use Caution/Monitor.

• atazanavir

  atazanavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• atogepant

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

• atorvastatin

  crizotinib increases levels of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of atorvastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• avanafil

  crizotinib increases levels of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• azithromycin

  crizotinib and azithromycin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  azithromycin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• bedaquiline

  crizotinib and bedaquiline both increase QTc interval. Modify Therapy/Monitor Closely. ECG should be monitored closely

• belzutifan

  belzutifan will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• berotralstat

  berotralstat will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor or titrate P-gp substrate dose if coadministered.

• betrixaban

  crizotinib increases levels of betrixaban by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Decrease betrixaban dose to 80 mg PO once, then 40 mg PO qDay if coadministered with a P-gp inhibitor.

• bicalutamide

  bicalutamide increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• bortezomib

  crizotinib increases levels of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• bosentan

  crizotinib increases levels of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• brexpiprazole

  crizotinib will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Administer a quarter of brexpiprazole dose if coadministered with a moderate CYP3A4 inhibitor PLUS a strong/moderate CYP2D6 inhibitor.

• bromocriptine

  crizotinib increases levels of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• budesonide

  crizotinib increases levels of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• buprenorphine

  crizotinib increases levels of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• buprenorphine buccal

  crizotinib increases levels of buprenorphine buccal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• buprenorphine subdermal implant

  crizotinib 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, long-acting injection

  crizotinib 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

  crizotinib increases levels of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cabazitaxel

  crizotinib increases levels of cabazitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cabozantinib

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

• calcium carbonate

  calcium carbonate decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• cannabidiol

  crizotinib 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.

• carbamazepine

  carbamazepine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• carvedilol

  crizotinib increases levels of carvedilol by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• cenobamate

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

• ceritinib

  crizotinib increases levels of ceritinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• cetirizine

  crizotinib increases levels of cetirizine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• chloroquine

  crizotinib increases levels of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  chloroquine increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• chlorpromazine

  crizotinib and chlorpromazine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ciclesonide inhaled

  crizotinib increases levels of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cilostazol

  crizotinib increases levels of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cimetidine

  cimetidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• cinacalcet

  crizotinib increases levels of cinacalcet by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ciprofloxacin

  crizotinib and ciprofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• citalopram

  crizotinib increases levels of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• clarithromycin

  clarithromycin increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• clofazimine

  crizotinib and clofazimine both increase QTc interval. Use Caution/Monitor.

• clomipramine

  crizotinib and clomipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• clonazepam

  crizotinib increases levels of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• conivaptan

  crizotinib increases levels of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• crofelemer

  crofelemer increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Crofelemer has the potential to inhibit CYP3A4 at concentrations expected in the gut; unlikely to inhibit systemically because minimally absorbed.

• cyclobenzaprine

  crizotinib and cyclobenzaprine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• cyclosporine

  crizotinib increases levels of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  cyclosporine increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• dabigatran

  crizotinib will increase the level or effect of dabigatran by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Atrial fibrillation: Avoid coadministering dabigatran with P-gp inhibitors if CrCl <30 mL/min. DVT/PE treatment: Avoid coadministering dabigatran with P-gp inhibitors if CrCl <50 mL/min

• dabrafenib

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

• dapsone

  crizotinib increases levels of dapsone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• daridorexant

  crizotinib 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

  crizotinib increases levels of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• darunavir

  darunavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• dasatinib

  crizotinib increases levels of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• daunorubicin

  crizotinib increases levels of daunorubicin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• deflazacort

  crizotinib will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease deflazacort dose to one-third of the recommended dose if coadministered with moderate or strong CYP3A4 inhibitors.

• degarelix

  crizotinib and degarelix both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• desipramine

  crizotinib and desipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• desloratadine

  crizotinib increases levels of desloratadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• deutetrabenazine

  crizotinib and deutetrabenazine both increase 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

  dexamethasone decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of dexamethasone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dexlansoprazole

  dexlansoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• diazepam

  crizotinib increases levels of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• diazepam intranasal

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

• dichlorphenamide

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

• digoxin

  crizotinib increases levels of digoxin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  crizotinib increases levels of digoxin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dihydroergotamine

  crizotinib increases levels of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• dihydroergotamine intranasal

  crizotinib increases levels of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• diltiazem

  crizotinib increases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  diltiazem increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• docetaxel

  crizotinib increases levels of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of docetaxel by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dofetilide

  crizotinib and dofetilide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  dofetilide increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• dolasetron

  crizotinib and dolasetron both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• doxepin

  doxepin and crizotinib both increase QTc interval. Use Caution/Monitor.

• doxorubicin

  crizotinib increases levels of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of doxorubicin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• doxorubicin liposomal

  crizotinib increases levels of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• droperidol

  crizotinib and droperidol both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• duvelisib

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

• efavirenz

  efavirenz increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• elagolix

  elagolix will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  elagolix will decrease the level or effect of crizotinib 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.

• eletriptan

  crizotinib increases levels of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.

• encorafenib

  encorafenib, crizotinib. 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.

• ergotamine

  crizotinib increases levels of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• erlotinib

  crizotinib increases levels of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• erythromycin base

  crizotinib increases levels of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin base by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  erythromycin base increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• erythromycin ethylsuccinate

  erythromycin ethylsuccinate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .
  
  crizotinib increases levels of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin ethylsuccinate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• erythromycin lactobionate

  erythromycin lactobionate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .
  
  crizotinib increases levels of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin lactobionate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• erythromycin stearate

  erythromycin stearate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .
  
  crizotinib increases levels of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin stearate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• escitalopram

  crizotinib increases levels of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib and escitalopram both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• esomeprazole

  esomeprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• eszopiclone

  crizotinib increases levels of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce eszopiclone starting dose to 1 mg/day.

• ethosuximide

  crizotinib increases levels of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• etoposide

  crizotinib increases levels of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of etoposide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• etravirine

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

• everolimus

  crizotinib increases levels of everolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• famotidine

  famotidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• fedratinib

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

• felodipine

  crizotinib increases levels of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fesoterodine

  crizotinib increases levels of fesoterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fexofenadine

  crizotinib increases levels of fexofenadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• finerenone

  crizotinib 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.

• flecainide

  crizotinib and flecainide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• fluconazole

  crizotinib and fluconazole both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  fluconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• fluoxetine

  crizotinib and fluoxetine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• fluphenazine

  crizotinib and fluphenazine both increase QTc interval. Use Caution/Monitor.

• flurazepam

  crizotinib increases levels of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fosamprenavir

  fosamprenavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of fosamprenavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• foscarnet

  crizotinib and foscarnet both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• fosphenytoin

  fosphenytoin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of fosphenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• fostemsavir

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

• gadobenate

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

• gemifloxacin

  crizotinib and gemifloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• gemtuzumab

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

• glecaprevir/pibrentasvir

  crizotinib will increase the level or effect of glecaprevir/pibrentasvir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• goserelin

  goserelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• grapefruit

  grapefruit increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• guanfacine

  crizotinib will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Strong or moderate CYP3A4 inhibitors significantly increase guanfacine plasma concentrations. FDA-approved labeling for extended-release (ER) guanfacine recommends that, if coadministered, the guanfacine dosage should be decreased to half of the recommended dose. Specific recommendations for immediate-release (IR) guanfacine are not available.

• haloperidol

  crizotinib increases levels of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• hawthorn

  crizotinib and hawthorn both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• histrelin

  histrelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• hydroxyprogesterone caproate

  crizotinib increases levels of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ibrutinib

  crizotinib 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.

• ibuprofen/famotidine

  ibuprofen/famotidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• ibutilide

  crizotinib and ibutilide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ifosfamide

  crizotinib will decrease the level or effect 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

  crizotinib and iloperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  iloperidone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Iloperidone is a time-dependent CYP3A inhibitor and may lead to increased plasma levels of drugs predominantly eliminated by CYP3A4.

• imatinib

  imatinib increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of imatinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• indapamide

  crizotinib and indapamide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• indinavir

  indinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of indinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• irinotecan

  crizotinib increases levels of irinotecan by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• irinotecan liposomal

  crizotinib increases levels of irinotecan liposomal by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• isavuconazonium sulfate

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

• isoniazid

  isoniazid increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• isradipine

  crizotinib and isradipine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• istradefylline

  istradefylline will increase the level or effect of crizotinib 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.
  
  istradefylline will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of P-gp substrates in clinical trials. Consider dose reduction of sensitive P-gp substrates.

• ivacaftor

  crizotinib 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

  crizotinib 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

  crizotinib increases levels of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• lansoprazole

  lansoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• lapatinib

  crizotinib increases levels of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of lapatinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  lapatinib increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• lefamulin

  crizotinib 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.

• lenvatinib

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

• leuprolide

  leuprolide increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• levalbuterol

  crizotinib and levalbuterol both increase QTc interval. Use Caution/Monitor.

• levamlodipine

  crizotinib 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

  crizotinib and levofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• loperamide

  crizotinib increases levels of loperamide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lopinavir

  lopinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• loratadine

  crizotinib increases levels of loratadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lorlatinib

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

• lovastatin

  crizotinib increases levels of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of lovastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lumateperone

  crizotinib 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

  crizotinib and lumefantrine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• magnesium hydroxide

  magnesium hydroxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• magnesium oxide

  magnesium oxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• maprotiline

  crizotinib and maprotiline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• maraviroc

  crizotinib increases levels of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• mavacamten

  crizotinib 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

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

• methadone

  crizotinib increases levels of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• methylergonovine

  crizotinib increases levels of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• midazolam

  crizotinib increases levels of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• mifepristone

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

• mirtazapine

  crizotinib increases levels of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• mitomycin

  crizotinib increases levels of mitomycin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• mitotane

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

• modafinil

  crizotinib increases levels of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• moxifloxacin

  crizotinib and moxifloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• nafcillin

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

• naldemedine

  crizotinib 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.
  
  crizotinib increases levels of naldemedine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor naldemedine for potential adverse effects if coadministered with P-gp inhibitors.

• nefazodone

  nefazodone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• nelfinavir

  nelfinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of nelfinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nicardipine

  nicardipine increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nifedipine

  crizotinib increases levels of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nilotinib

  crizotinib increases levels of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• nimodipine

  crizotinib increases levels of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nintedanib

  crizotinib increases levels of nintedanib by P-glycoprotein (MDR1) efflux transporter. Modify Therapy/Monitor Closely. If nintedanib adverse effects occur, management may require interruption, dose reduction, or discontinuation of therapy.

• nisoldipine

  crizotinib increases levels of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nizatidine

  nizatidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• nortriptyline

  crizotinib and nortriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• octreotide

  crizotinib and octreotide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ofloxacin

  crizotinib and ofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• oliceridine

  crizotinib 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.

• olodaterol inhaled

  crizotinib and olodaterol inhaled both increase QTc interval. Use Caution/Monitor.

• omeprazole

  omeprazole will decrease the level or effect of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted.

• ondansetron

  crizotinib increases levels of ondansetron by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• osilodrostat

  osilodrostat and crizotinib both increase QTc interval. Use Caution/Monitor.

• osimertinib

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

• oxaliplatin

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

• oxcarbazepine

  oxcarbazepine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• oxycodone

  crizotinib increases levels of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ozanimod

  ozanimod and crizotinib 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

  crizotinib increases levels of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of paclitaxel by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• paclitaxel protein bound

  crizotinib increases levels of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of paclitaxel protein bound by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• palbociclib

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

• paliperidone

  crizotinib and paliperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• pantoprazole

  pantoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• pasireotide

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

• pazopanib

  crizotinib increases levels of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of pazopanib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• pentamidine

  crizotinib and pentamidine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• perphenazine

  crizotinib and perphenazine both increase QTc interval. Use Caution/Monitor.

• phenobarbital

  phenobarbital decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• phenytoin

  phenytoin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of phenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• posaconazole

  posaconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• pravastatin

  crizotinib increases levels of pravastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• praziquantel

  crizotinib increases levels of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• procainamide

  crizotinib and procainamide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• propafenone

  crizotinib and propafenone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• protriptyline

  crizotinib and protriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• quetiapine

  crizotinib increases levels of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• quinine

  crizotinib increases levels of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and quinine both increase QTc interval. Use Caution/Monitor.

• rabeprazole

  rabeprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• ranolazine

  crizotinib increases levels of ranolazine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• repaglinide

  crizotinib increases levels of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• rifabutin

  rifabutin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• rifampin

  rifampin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of rifampin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rifapentine

  rifapentine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• rifaximin

  crizotinib increases levels of rifaximin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rilpivirine

  crizotinib increases levels of rilpivirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• rimegepant

  crizotinib 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.

• risperidone

  crizotinib and risperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ritonavir

  ritonavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of ritonavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rivaroxaban

  crizotinib increases levels of rivaroxaban by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• romidepsin

  crizotinib increases levels of romidepsin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib and romidepsin both increase QTc interval. Use Caution/Monitor.

• rucaparib

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

• salmeterol

  crizotinib and salmeterol both increase QTc interval. Use Caution/Monitor.

• saquinavir

  saquinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of saquinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• sarecycline

  sarecycline will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor for toxicities of P-gp substrates that may require dosage reduction when coadministered with P-gp inhibitors.

• saxagliptin

  crizotinib increases levels of saxagliptin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• selpercatinib

  selpercatinib increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• silodosin

  crizotinib increases levels of silodosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of silodosin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• simvastatin

  crizotinib increases levels of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• siponimod

  siponimod and crizotinib 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

  crizotinib increases levels of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  crizotinib increases levels of sirolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sitagliptin

  crizotinib increases levels of sitagliptin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sodium bicarbonate

  sodium bicarbonate decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• sodium zirconium cyclosilicate

  sodium zirconium cyclosilicate will decrease the level or effect of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Modify Therapy/Monitor Closely. Check specific recommendations for drugs that exhibit pH-dependent solubility that may affect their systemic exposure and efficacy. In general, administer drugs at least 2 hr before or after sodium zirconium cyclosilicate.

• solifenacin

  crizotinib increases levels of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• sonidegib

  crizotinib will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid coadministration of sonidegib with moderate CYP3A4 inhibitors. If a moderate CYP3A inhibitor must be used, administer the moderate CYP3A inhibitor for <14 days and monitor closely for adverse reactions, particularly musculoskeletal adverse reactions.

• sorafenib

  sorafenib and crizotinib both increase QTc interval. Use Caution/Monitor.

• sotalol

  crizotinib and sotalol both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• St John's Wort

  St John's Wort decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• stiripentol

  stiripentol, crizotinib. 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.
  
  stiripentol will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Modify Therapy/Monitor Closely. Consider reducing the dose of P-glycoprotein (P-gp) substrates, if adverse reactions are experienced when administered concomitantly with stiripentol.

• sufentanil

  crizotinib increases levels of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• sufentanil SL

  crizotinib 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

  crizotinib increases effects of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• suvorexant

  crizotinib will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease suvorexant starting dose to 5 mg HS if coadministered with moderate CYP3A4 inhibitors

• tacrolimus

  crizotinib increases levels of tacrolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• tadalafil

  crizotinib increases levels of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tamoxifen

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

• tamsulosin

  crizotinib increases levels of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tazemetostat

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

• tecovirimat

  tecovirimat will decrease the level or effect of crizotinib 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

  crizotinib and telavancin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• temsirolimus

  crizotinib increases levels of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• teniposide

  crizotinib increases levels of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of teniposide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• tezacaftor

  crizotinib 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

  crizotinib increases levels of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• thiothixene

  crizotinib and thiothixene both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• tiagabine

  crizotinib increases levels of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tinidazole

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

• tipranavir

  tipranavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• tofacitinib

  crizotinib increases levels of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No specific dose adjustment recommended when tofacitinib coadministered with moderate CYP3A4 inhibitors; decrease tofacitinib dose if coadministered with both moderate CYP3A4 and potent CYP2C19 inhibitors.

• tolterodine

  crizotinib increases levels of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tolvaptan

  crizotinib increases levels of tolvaptan by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• toremifene

  crizotinib and toremifene both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• trabectedin

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

• tramadol

  crizotinib increases levels of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• trazodone

  crizotinib increases levels of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• triazolam

  crizotinib increases levels of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• trimipramine

  crizotinib and trimipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• triptorelin

  triptorelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• tucatinib

  tucatinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Consider reducing the dosage of P-gp substrates, where minimal concentration changes may lead to serious or life-threatening toxicities.

• valbenazine

  valbenazine and crizotinib both increase QTc interval. Use Caution/Monitor.

• vandetanib

  crizotinib and vandetanib both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• vardenafil

  crizotinib increases levels of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• vemurafenib

  crizotinib and vemurafenib both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• verapamil

  crizotinib increases levels of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of verapamil by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  verapamil increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• vinblastine

  crizotinib increases levels of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vinblastine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vincristine

  crizotinib increases levels of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vincristine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vincristine liposomal

  crizotinib increases levels of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vincristine liposomal by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vinorelbine

  crizotinib increases levels of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• voclosporin

  crizotinib 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, crizotinib. Either increases effects of the other by QTc interval. Use Caution/Monitor.

• voriconazole

  voriconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• vorinostat

  crizotinib and vorinostat both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• zanubrutinib

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

• ziprasidone

  crizotinib and ziprasidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• zolpidem

  crizotinib increases levels of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• zonisamide

  crizotinib increases levels of zonisamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

Minor (4)

• entecavir

  crizotinib, entecavir. Either increases effects of the other by decreasing renal clearance. Minor/Significance Unknown. Coadministration with drugs that reduce renal function or compete for active tubular secretion may increase serum concentrations of either entecavir or the coadministered drug.

• estradiol vaginal

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

• lapatinib

  crizotinib and lapatinib both increase QTc interval. Minor/Significance Unknown.

• rilpivirine

  crizotinib and rilpivirine both increase QTc interval. Minor/Significance Unknown.

• abametapir

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

• abiraterone

  Monitor Closely (1)abiraterone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• acalabrutinib

  Monitor Closely (1)crizotinib 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.

• albuterol

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

• alfentanil

  Monitor Closely (1)crizotinib increases levels of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• alfuzosin

  Monitor Closely (2)crizotinib and alfuzosin both increase QTc interval. Use Caution/Monitor.
  
  crizotinib increases levels of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)alfuzosin and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• aliskiren

  Monitor Closely (1)crizotinib increases levels of aliskiren by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• alprazolam

  Monitor Closely (1)crizotinib increases levels of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• aluminum hydroxide

  Monitor Closely (1)aluminum hydroxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• amiodarone

  Monitor Closely (2)crizotinib increases levels of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  amiodarone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)crizotinib and amiodarone both increase QTc interval. Avoid or Use Alternate Drug.

• amisulpride

  Serious - Use Alternative (1)crizotinib and amisulpride both increase QTc interval. Avoid or Use Alternate Drug. ECG monitoring is recommended if coadministered.

• amitriptyline

  Monitor Closely (1)crizotinib and amitriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• amlodipine

  Monitor Closely (1)crizotinib increases levels of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• amoxapine

  Monitor Closely (1)crizotinib and amoxapine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• anagrelide

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

• apalutamide

  Serious - Use Alternative (1)apalutamide will decrease the level or effect of crizotinib 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.

• apomorphine

  Monitor Closely (1)crizotinib and apomorphine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• aprepitant

  Monitor Closely (2)aprepitant increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .
  
  crizotinib increases levels of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• arformoterol

  Monitor Closely (1)arformoterol and crizotinib both increase QTc interval. Use Caution/Monitor.

• aripiprazole

  Monitor Closely (1)crizotinib increases levels of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)aripiprazole and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• armodafinil

  Monitor Closely (1)crizotinib increases levels of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• arsenic trioxide

  Monitor Closely (1)crizotinib and arsenic trioxide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• artemether

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

• artemether/lumefantrine

  Monitor Closely (1)crizotinib and artemether/lumefantrine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• asenapine

  Monitor Closely (1)crizotinib and asenapine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• asenapine transdermal

  Monitor Closely (1)asenapine transdermal and crizotinib both increase QTc interval. Use Caution/Monitor.

• atazanavir

  Monitor Closely (2)atazanavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• atogepant

  Monitor Closely (1)crizotinib 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 crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• atorvastatin

  Monitor Closely (2)crizotinib increases levels of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of atorvastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• avanafil

  Monitor Closely (1)crizotinib increases levels of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• avapritinib

  Serious - Use Alternative (1)crizotinib 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

  Monitor Closely (2)crizotinib and azithromycin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  azithromycin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• bedaquiline

  Monitor Closely (1)crizotinib and bedaquiline both increase QTc interval. Modify Therapy/Monitor Closely. ECG should be monitored closely

• belzutifan

  Monitor Closely (1)belzutifan will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• berotralstat

  Monitor Closely (1)berotralstat will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor or titrate P-gp substrate dose if coadministered.

• betrixaban

  Monitor Closely (1)crizotinib increases levels of betrixaban by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Decrease betrixaban dose to 80 mg PO once, then 40 mg PO qDay if coadministered with a P-gp inhibitor.

• bicalutamide

  Monitor Closely (1)bicalutamide increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• bortezomib

  Monitor Closely (1)crizotinib increases levels of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• bosentan

  Monitor Closely (1)crizotinib increases levels of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• bosutinib

  Serious - Use Alternative (1)crizotinib increases levels of bosutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• brexpiprazole

  Monitor Closely (1)crizotinib will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Administer a quarter of brexpiprazole dose if coadministered with a moderate CYP3A4 inhibitor PLUS a strong/moderate CYP2D6 inhibitor.

• bromocriptine

  Monitor Closely (1)crizotinib increases levels of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• budesonide

  Monitor Closely (1)crizotinib increases levels of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• buprenorphine

  Monitor Closely (1)crizotinib increases levels of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)crizotinib and buprenorphine both increase QTc interval. Avoid or Use Alternate Drug.

• buprenorphine buccal

  Monitor Closely (1)crizotinib increases levels of buprenorphine buccal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• buprenorphine subdermal implant

  Monitor Closely (1)crizotinib 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, long-acting injection

  Monitor Closely (1)crizotinib 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

  Monitor Closely (1)crizotinib increases levels of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cabazitaxel

  Monitor Closely (1)crizotinib increases levels of cabazitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cabozantinib

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

• calcium carbonate

  Monitor Closely (1)calcium carbonate decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• cannabidiol

  Monitor Closely (1)crizotinib 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.

• carbamazepine

  Monitor Closely (2)carbamazepine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• carvedilol

  Monitor Closely (1)crizotinib increases levels of carvedilol by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• cenobamate

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

• ceritinib

  Monitor Closely (1)crizotinib increases levels of ceritinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)ceritinib and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• cetirizine

  Monitor Closely (1)crizotinib increases levels of cetirizine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• chloramphenicol

  Serious - Use Alternative (1)chloramphenicol will increase the level or effect of crizotinib by aldehyde dehydrogenase inhibition. Avoid or Use Alternate Drug.

• chloroquine

  Monitor Closely (2)chloroquine increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.
  
  crizotinib increases levels of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• chlorpromazine

  Monitor Closely (1)crizotinib and chlorpromazine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ciclesonide inhaled

  Monitor Closely (1)crizotinib increases levels of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cilostazol

  Monitor Closely (1)crizotinib increases levels of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• cimetidine

  Monitor Closely (1)cimetidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• cinacalcet

  Monitor Closely (1)crizotinib increases levels of cinacalcet by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ciprofloxacin

  Monitor Closely (1)crizotinib and ciprofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• citalopram

  Monitor Closely (1)crizotinib increases levels of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)citalopram and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• clarithromycin

  Monitor Closely (1)clarithromycin increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)clarithromycin and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• clofazimine

  Monitor Closely (1)crizotinib and clofazimine both increase QTc interval. Use Caution/Monitor.

• clomipramine

  Monitor Closely (1)crizotinib and clomipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• clonazepam

  Monitor Closely (1)crizotinib increases levels of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• clozapine

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

• cobicistat

  Serious - Use Alternative (1)cobicistat 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; May reduce crizotinib dose to 250 mg PO qDay if concomitant administration cannot be avoided.

• cobimetinib

  Serious - Use Alternative (1)crizotinib will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concurrent short term (14 days or less) use of moderate CYP3A inhibitors is unavoidable for patients who are taking cobimetinib 60 mg, reduce the cobimetinib dose to 20 mg. After discontinuation of a moderate CYP3A inhibitor, resume cobimetinib 60 mg. Use an alternative to a moderate CYP3A inhibitor in patients who are taking a reduced dose of cobimetinib (40 or 20 mg daily).

• conivaptan

  Monitor Closely (1)crizotinib increases levels of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)conivaptan 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

• crofelemer

  Monitor Closely (1)crofelemer increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Crofelemer has the potential to inhibit CYP3A4 at concentrations expected in the gut; unlikely to inhibit systemically because minimally absorbed.

• cyclobenzaprine

  Monitor Closely (1)crizotinib and cyclobenzaprine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• cyclosporine

  Monitor Closely (2)crizotinib increases levels of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  cyclosporine increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• dabigatran

  Monitor Closely (1)crizotinib will increase the level or effect of dabigatran by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Atrial fibrillation: Avoid coadministering dabigatran with P-gp inhibitors if CrCl <30 mL/min. DVT/PE treatment: Avoid coadministering dabigatran with P-gp inhibitors if CrCl <50 mL/min

• dabrafenib

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

• dapsone

  Monitor Closely (1)crizotinib increases levels of dapsone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• daridorexant

  Monitor Closely (1)crizotinib 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

  Monitor Closely (1)crizotinib increases levels of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• darunavir

  Monitor Closely (2)darunavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• dasatinib

  Monitor Closely (1)crizotinib increases levels of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and dasatinib both increase QTc interval. Avoid or Use Alternate Drug.

• daunorubicin

  Monitor Closely (1)crizotinib increases levels of daunorubicin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• deflazacort

  Monitor Closely (1)crizotinib will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease deflazacort dose to one-third of the recommended dose if coadministered with moderate or strong CYP3A4 inhibitors.

• degarelix

  Monitor Closely (1)crizotinib and degarelix both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• desflurane

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

• desipramine

  Monitor Closely (1)crizotinib and desipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• desloratadine

  Monitor Closely (1)crizotinib increases levels of desloratadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• deutetrabenazine

  Monitor Closely (1)crizotinib and deutetrabenazine both increase 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 (3)dexamethasone decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of dexamethasone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dexlansoprazole

  Monitor Closely (1)dexlansoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• diazepam

  Monitor Closely (1)crizotinib increases levels of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• diazepam intranasal

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

• dichlorphenamide

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

• digoxin

  Monitor Closely (2)crizotinib increases levels of digoxin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  crizotinib increases levels of digoxin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dihydroergotamine

  Monitor Closely (1)crizotinib increases levels of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• dihydroergotamine intranasal

  Monitor Closely (1)crizotinib increases levels of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• diltiazem

  Monitor Closely (2)crizotinib increases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  diltiazem increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• disopyramide

  Serious - Use Alternative (2)crizotinib and disopyramide both increase QTc interval. Avoid or Use Alternate Drug.
  
  crizotinib increases levels of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• docetaxel

  Monitor Closely (2)crizotinib increases levels of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of docetaxel by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• dofetilide

  Monitor Closely (2)crizotinib and dofetilide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  dofetilide increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• dolasetron

  Monitor Closely (1)crizotinib and dolasetron both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• donepezil

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

• doxepin

  Monitor Closely (1)doxepin and crizotinib both increase QTc interval. Use Caution/Monitor.

• doxorubicin

  Monitor Closely (2)crizotinib increases levels of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of doxorubicin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• doxorubicin liposomal

  Monitor Closely (1)crizotinib increases levels of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• dronedarone

  Contraindicated (1)crizotinib and dronedarone both increase QTc interval. Contraindicated. Dronedarone is contraindicated with drugs that may prolong the QT interval. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• droperidol

  Monitor Closely (1)crizotinib and droperidol both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• duvelisib

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

• edoxaban

  Serious - Use Alternative (1)crizotinib will increase the level or effect of edoxaban by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Dose adjustment may be required with strong P-gp inhibitors. DVT/PE treatment: Decrease dose to 30 mg PO once daily. NVAF: No dose reduction recommended

• efavirenz

  Monitor Closely (1)efavirenz increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)efavirenz and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• elagolix

  Monitor Closely (2)elagolix will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  elagolix will decrease the level or effect of crizotinib 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.

• eletriptan

  Monitor Closely (1)crizotinib increases levels of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• eliglustat

  Serious - Use Alternative (2)crizotinib increases levels of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Moderate CYP3A4 inhibitors are not recommended with eliglustat poor or intermediate metabolizers; reduce eliglustat dose from 84 mg BID to 84 mg once daily in extensive metabolizers .
  
  crizotinib and eliglustat both increase QTc interval. Avoid or Use Alternate Drug.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  Monitor Closely (1)elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.

• encorafenib

  Monitor Closely (1)encorafenib, crizotinib. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.Serious - Use Alternative (2)crizotinib 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.
  
  crizotinib and encorafenib both increase QTc interval. Avoid or Use Alternate Drug.

• entecavir

  Minor (1)crizotinib, entecavir. Either increases effects of the other by decreasing renal clearance. Minor/Significance Unknown. Coadministration with drugs that reduce renal function or compete for active tubular secretion may increase serum concentrations of either entecavir or the coadministered drug.

• entrectinib

  Serious - Use Alternative (2)crizotinib and entrectinib both increase QTc interval. Avoid or Use Alternate Drug.
  
  crizotinib 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.

• erdafitinib

  Serious - Use Alternative (1)erdafitinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If coadministration unavoidable, separate administration by at least 6 hr before or after administration of P-gp substrates with narrow therapeutic index.

• ergotamine

  Monitor Closely (1)crizotinib increases levels of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• eribulin

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

• erlotinib

  Monitor Closely (1)crizotinib increases levels of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• erythromycin base

  Monitor Closely (3)crizotinib increases levels of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin base by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  erythromycin base increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)crizotinib and erythromycin base both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  Monitor Closely (3)crizotinib increases levels of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin ethylsuccinate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  erythromycin ethylsuccinate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)crizotinib and erythromycin ethylsuccinate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  Monitor Closely (3)crizotinib increases levels of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin lactobionate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  erythromycin lactobionate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)crizotinib and erythromycin lactobionate both increase QTc interval. Avoid or Use Alternate Drug.

• erythromycin stearate

  Monitor Closely (3)crizotinib increases levels of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of erythromycin stearate by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  erythromycin stearate increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Serious - Use Alternative (1)crizotinib and erythromycin stearate both increase QTc interval. Avoid or Use Alternate Drug.

• escitalopram

  Monitor Closely (2)crizotinib and escitalopram both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)escitalopram increases toxicity of crizotinib by QTc interval. Avoid or Use Alternate Drug.

• eslicarbazepine acetate

  Serious - Use Alternative (1)eslicarbazepine acetate will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• esomeprazole

  Monitor Closely (1)esomeprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• estradiol vaginal

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

• eszopiclone

  Monitor Closely (1)crizotinib increases levels of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce eszopiclone starting dose to 1 mg/day.

• ethosuximide

  Monitor Closely (1)crizotinib increases levels of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• etoposide

  Monitor Closely (2)crizotinib increases levels of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of etoposide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• etravirine

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

• everolimus

  Monitor Closely (1)crizotinib increases levels of everolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• famotidine

  Monitor Closely (1)famotidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• fedratinib

  Monitor Closely (1)fedratinib will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

• felodipine

  Monitor Closely (1)crizotinib increases levels of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fentanyl

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

• fentanyl intranasal

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

• fentanyl transdermal

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

• fentanyl transmucosal

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

• fesoterodine

  Monitor Closely (1)crizotinib increases levels of fesoterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fexinidazole

  Serious - Use Alternative (2)fexinidazole and crizotinib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of fexinidazole with drugs known to block potassium channels or prolong QT interval.
  
  fexinidazole will increase the level or effect of crizotinib 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.

• fexofenadine

  Monitor Closely (1)crizotinib increases levels of fexofenadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• finerenone

  Monitor Closely (1)crizotinib 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 (1)fingolimod and crizotinib both increase QTc interval. Avoid or Use Alternate Drug.

• flecainide

  Monitor Closely (1)crizotinib and flecainide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• flibanserin

  Contraindicated (1)crizotinib will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Coadministration of flibanserin with moderate or strong CYP3A4 inhibitors is contraindicated. Severe hypotension or syncope can occur.

• fluconazole

  Monitor Closely (2)crizotinib and fluconazole both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  fluconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• fluoxetine

  Monitor Closely (1)crizotinib and fluoxetine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• fluphenazine

  Monitor Closely (1)crizotinib and fluphenazine both increase QTc interval. Use Caution/Monitor.

• flurazepam

  Monitor Closely (1)crizotinib increases levels of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• fosamprenavir

  Monitor Closely (2)fosamprenavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of fosamprenavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• foscarnet

  Monitor Closely (1)crizotinib and foscarnet both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• fosphenytoin

  Monitor Closely (2)fosphenytoin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of fosphenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• fostemsavir

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

• gadobenate

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

• gemifloxacin

  Monitor Closely (1)crizotinib and gemifloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• gemtuzumab

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

• gilteritinib

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

• glasdegib

  Serious - Use Alternative (1)crizotinib and glasdegib both increase QTc interval. Avoid or Use Alternate Drug. If coadministration unavoidable, monitor for increased risk of QTc interval prolongation.

• glecaprevir/pibrentasvir

  Monitor Closely (1)crizotinib will increase the level or effect of glecaprevir/pibrentasvir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• goserelin

  Monitor Closely (1)goserelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• granisetron

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

• grapefruit

  Monitor Closely (1)grapefruit increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• guanfacine

  Monitor Closely (1)crizotinib will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Strong or moderate CYP3A4 inhibitors significantly increase guanfacine plasma concentrations. FDA-approved labeling for extended-release (ER) guanfacine recommends that, if coadministered, the guanfacine dosage should be decreased to half of the recommended dose. Specific recommendations for immediate-release (IR) guanfacine are not available.

• haloperidol

  Monitor Closely (1)crizotinib increases levels of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and haloperidol both increase QTc interval. Avoid or Use Alternate Drug.

• hawthorn

  Monitor Closely (1)crizotinib and hawthorn both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• histrelin

  Monitor Closely (1)histrelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• hydroxychloroquine sulfate

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

• hydroxyprogesterone caproate

  Monitor Closely (1)crizotinib increases levels of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• hydroxyzine

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

• ibrutinib

  Monitor Closely (1)crizotinib 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.

• ibuprofen/famotidine

  Monitor Closely (1)ibuprofen/famotidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• ibutilide

  Monitor Closely (1)crizotinib and ibutilide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• idelalisib

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

• ifosfamide

  Monitor Closely (1)crizotinib will decrease the level or effect 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

  Monitor Closely (2)crizotinib and iloperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  iloperidone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Iloperidone is a time-dependent CYP3A inhibitor and may lead to increased plasma levels of drugs predominantly eliminated by CYP3A4.

• imatinib

  Monitor Closely (3)imatinib increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of imatinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• indacaterol, inhaled

  Serious - Use Alternative (1)crizotinib and indacaterol, inhaled both increase QTc interval. Avoid or Use Alternate Drug.

• indapamide

  Monitor Closely (1)crizotinib and indapamide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• indinavir

  Monitor Closely (2)indinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of indinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• infigratinib

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

• inotuzumab

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

• irinotecan

  Monitor Closely (1)crizotinib increases levels of irinotecan by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)crizotinib will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• irinotecan liposomal

  Monitor Closely (1)crizotinib increases levels of irinotecan liposomal by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)crizotinib will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• isavuconazonium sulfate

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

• isoflurane

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

• isoniazid

  Monitor Closely (1)isoniazid increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• isradipine

  Monitor Closely (2)crizotinib and isradipine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• istradefylline

  Monitor Closely (2)istradefylline will increase the level or effect of crizotinib 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.
  
  istradefylline will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of P-gp substrates in clinical trials. Consider dose reduction of sensitive P-gp substrates.

• itraconazole

  Serious - Use Alternative (2)itraconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If combination cannot be avoided, decrease crizotinib dose to 250 mg daily. Monitor for increased crizotinib toxicities, including QTc interval prolongation and ventricular arrhythmias. .
  
  crizotinib and itraconazole both increase QTc interval. Avoid or Use Alternate Drug.

• ivabradine

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

• ivacaftor

  Monitor Closely (1)crizotinib 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)crizotinib 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 (2)ivosidenib and crizotinib both increase QTc interval. Avoid or Use Alternate Drug. Avoid coadministration of QTc prolonging drugs with ivosidenib or replace with alternate therapies. If coadministration of a QTc prolonging drug is unavoidable, monitor for increased risk of QTc interval prolongation.
  
  ivosidenib will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternate therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

• ixabepilone

  Monitor Closely (1)crizotinib increases levels of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ketoconazole

  Serious - Use Alternative (1)ketoconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. See prescribing information for precise dosage modification.

• lansoprazole

  Monitor Closely (1)lansoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• lapatinib

  Monitor Closely (3)crizotinib increases levels of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of lapatinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  lapatinib increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .Minor (1)crizotinib and lapatinib both increase QTc interval. Minor/Significance Unknown.

• lasmiditan

  Serious - Use Alternative (1)lasmiditan increases levels of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

• lefamulin

  Contraindicated (1)lefamulin will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Lefamulin is contraindicated with CYP3A substrates know to prolong the QT interval.Monitor Closely (1)crizotinib 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.Serious - Use Alternative (1)crizotinib and lefamulin both increase QTc interval. Avoid or Use Alternate Drug.

• lemborexant

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

• lenvatinib

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

• leuprolide

  Monitor Closely (1)leuprolide increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• levalbuterol

  Monitor Closely (1)crizotinib and levalbuterol both increase QTc interval. Use Caution/Monitor.

• levamlodipine

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

• levofloxacin

  Monitor Closely (1)crizotinib and levofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• levoketoconazole

  Serious - Use Alternative (1)levoketoconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. See prescribing information for precise dosage modification.

• lithium

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

• lofexidine

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

• lomitapide

  Contraindicated (1)crizotinib increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. Increases lomitapide levels several folds.

• lonafarnib

  Contraindicated (1)crizotinib 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.

• loperamide

  Monitor Closely (1)crizotinib increases levels of loperamide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)crizotinib and loperamide both increase QTc interval. Avoid or Use Alternate Drug.

• lopinavir

  Monitor Closely (1)lopinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and lopinavir both increase QTc interval. Avoid or Use Alternate Drug.

• loratadine

  Monitor Closely (1)crizotinib increases levels of loratadine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lorlatinib

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

• lovastatin

  Monitor Closely (2)crizotinib increases levels of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of lovastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lumateperone

  Monitor Closely (1)crizotinib 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

  Monitor Closely (1)crizotinib and lumefantrine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• lurbinectedin

  Serious - Use Alternative (1)crizotinib 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 crizotinib 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.

• magnesium hydroxide

  Monitor Closely (1)magnesium hydroxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• magnesium oxide

  Monitor Closely (1)magnesium oxide decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• maprotiline

  Monitor Closely (1)crizotinib and maprotiline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• maraviroc

  Monitor Closely (1)crizotinib increases levels of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• mavacamten

  Monitor Closely (1)crizotinib 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

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

• methadone

  Monitor Closely (1)crizotinib increases levels of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and methadone both increase QTc interval. Avoid or Use Alternate Drug.

• methylergonovine

  Monitor Closely (1)crizotinib increases levels of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• midazolam

  Monitor Closely (1)crizotinib increases levels of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• midazolam intranasal

  Serious - Use Alternative (1)crizotinib 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

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

• mifepristone

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

• mirtazapine

  Monitor Closely (1)crizotinib increases levels of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)crizotinib and mirtazapine both increase QTc interval. Avoid or Use Alternate Drug.

• mitomycin

  Monitor Closely (1)crizotinib increases levels of mitomycin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• mitotane

  Monitor Closely (1)mitotane decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• mobocertinib

  Serious - Use Alternative (2)crizotinib 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 crizotinib 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)crizotinib increases levels of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• moxifloxacin

  Monitor Closely (1)crizotinib and moxifloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• nafcillin

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

• naldemedine

  Monitor Closely (2)crizotinib 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.
  
  crizotinib increases levels of naldemedine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor naldemedine for potential adverse effects if coadministered with P-gp inhibitors.

• naloxegol

  Serious - Use Alternative (1)crizotinib will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministation of naloxegol with moderate CYP3A4 inhibitors is unavoidable, reduce naloxegol dose to 12.5 mg qDay

• nefazodone

  Monitor Closely (1)nefazodone increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• nelfinavir

  Monitor Closely (2)nelfinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of nelfinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• neratinib

  Serious - Use Alternative (1)crizotinib 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

  Monitor Closely (2)nicardipine increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .
  
  crizotinib increases levels of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nifedipine

  Monitor Closely (1)crizotinib increases levels of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nilotinib

  Monitor Closely (1)crizotinib increases levels of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and nilotinib both increase QTc interval. Avoid or Use Alternate Drug.

• nimodipine

  Monitor Closely (1)crizotinib increases levels of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nintedanib

  Monitor Closely (1)crizotinib increases levels of nintedanib by P-glycoprotein (MDR1) efflux transporter. Modify Therapy/Monitor Closely. If nintedanib adverse effects occur, management may require interruption, dose reduction, or discontinuation of therapy.

• nisoldipine

  Monitor Closely (1)crizotinib increases levels of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• nizatidine

  Monitor Closely (1)nizatidine decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• nortriptyline

  Monitor Closely (1)crizotinib and nortriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• octreotide

  Monitor Closely (1)crizotinib and octreotide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ofloxacin

  Monitor Closely (1)crizotinib and ofloxacin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• olanzapine

  Serious - Use Alternative (1)crizotinib and olanzapine both increase 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

  Serious - Use Alternative (1)crizotinib will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with moderate CYP3A inhibitors cannot be avoided, reduce olaparib dose to 200 mg (capsule) or 150 mg (tablet) PO BID. Do not substitute tablets with capsules.

• oliceridine

  Monitor Closely (1)crizotinib 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.

• olodaterol inhaled

  Monitor Closely (1)crizotinib and olodaterol inhaled both increase QTc interval. Use Caution/Monitor.

• omeprazole

  Monitor Closely (1)omeprazole will decrease the level or effect of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted.

• ondansetron

  Monitor Closely (1)crizotinib increases levels of ondansetron by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)crizotinib and ondansetron both decrease QTc interval. Avoid or Use Alternate Drug. Avoid with congenital long QT syndrome; ECG monitoring recommended with concomitant medications that prolong QT interval, electrolyte abnormalities, CHF, or bradyarrhythmias.

• osilodrostat

  Monitor Closely (1)osilodrostat and crizotinib both increase QTc interval. Use Caution/Monitor.

• osimertinib

  Monitor Closely (1)osimertinib and crizotinib both increase QTc interval. Use Caution/Monitor. Conduct periodic monitoring with ECGs and electrolytes in patients taking drugs known to prolong the QTc interval.

• oxaliplatin

  Monitor Closely (1)oxaliplatin will increase the level or effect of crizotinib 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)crizotinib and oxaliplatin both increase QTc interval. Avoid or Use Alternate Drug.

• oxcarbazepine

  Monitor Closely (1)oxcarbazepine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• oxycodone

  Monitor Closely (1)crizotinib increases levels of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ozanimod

  Monitor Closely (1)ozanimod and crizotinib 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 (2)crizotinib increases levels of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of paclitaxel by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• paclitaxel protein bound

  Monitor Closely (2)crizotinib increases levels of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of paclitaxel protein bound by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• pacritinib

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

• palbociclib

  Monitor Closely (1)crizotinib 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 crizotinib 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

  Monitor Closely (1)crizotinib and paliperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• panobinostat

  Serious - Use Alternative (1)crizotinib and panobinostat both increase QTc interval. Avoid or Use Alternate Drug. Panobinostat is known to significantly prolong QT interval. Panobinostat prescribing information states use with drugs known to prolong QTc is not recommended.

• pantoprazole

  Monitor Closely (1)pantoprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• pasireotide

  Monitor Closely (1)crizotinib and pasireotide both increase QTc interval. Modify Therapy/Monitor Closely.

• pazopanib

  Monitor Closely (2)crizotinib increases levels of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of pazopanib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and pazopanib both increase QTc interval. Avoid or Use Alternate Drug.

• pemigatinib

  Serious - Use Alternative (1)crizotinib will increase the level or effect of pemigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pemigatinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pemigatinib dose.

• pentamidine

  Monitor Closely (1)crizotinib and pentamidine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• perphenazine

  Monitor Closely (1)crizotinib and perphenazine both increase QTc interval. Use Caution/Monitor.

• pexidartinib

  Serious - Use Alternative (1)crizotinib 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

  Monitor Closely (1)phenobarbital decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• phenytoin

  Monitor Closely (2)phenytoin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of phenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• pimavanserin

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

• pimozide

  Contraindicated (1)crizotinib and pimozide both increase QTc interval. Contraindicated. Pimozide is contraindicated with drugs that may prolong the QT interval. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• pitolisant

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

• ponesimod

  Serious - Use Alternative (2)ponesimod, crizotinib. Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Consult cardiologist if considering treatment. Coadministration of ponesimod with drugs that decrease HR may have additive effects on decreasing HR and should generally not be initiated in these patients.
  
  crizotinib and ponesimod both increase QTc interval. Avoid or Use Alternate Drug.

• posaconazole

  Contraindicated (1)crizotinib and posaconazole both increase QTc interval. Contraindicated.Monitor Closely (1)posaconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• pravastatin

  Monitor Closely (1)crizotinib increases levels of pravastatin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• praziquantel

  Monitor Closely (1)crizotinib increases levels of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• primaquine

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

• primidone

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

• procainamide

  Monitor Closely (1)crizotinib and procainamide both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• propafenone

  Monitor Closely (1)crizotinib and propafenone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• protriptyline

  Monitor Closely (1)crizotinib and protriptyline both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• quetiapine

  Monitor Closely (1)crizotinib increases levels of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and quetiapine both increase QTc interval. Avoid or Use Alternate Drug.

• quinidine

  Serious - Use Alternative (2)crizotinib and quinidine both increase QTc interval. Avoid or Use Alternate Drug.
  
  crizotinib increases levels of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• quinine

  Monitor Closely (2)crizotinib increases levels of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and quinine both increase QTc interval. Use Caution/Monitor.

• rabeprazole

  Monitor Closely (1)rabeprazole decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• ranolazine

  Monitor Closely (1)crizotinib increases levels of ranolazine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and ranolazine both increase QTc interval. Avoid or Use Alternate Drug.

• repaglinide

  Monitor Closely (1)crizotinib increases levels of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• ribociclib

  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.

• rifabutin

  Monitor Closely (1)rifabutin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• rifampin

  Monitor Closely (2)rifampin decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .
  
  crizotinib increases levels of rifampin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rifapentine

  Monitor Closely (1)rifapentine decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• rifaximin

  Monitor Closely (1)crizotinib increases levels of rifaximin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rilpivirine

  Monitor Closely (1)crizotinib increases levels of rilpivirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Minor (1)crizotinib and rilpivirine both increase QTc interval. Minor/Significance Unknown.

• rimegepant

  Monitor Closely (1)crizotinib 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.

• risperidone

  Monitor Closely (1)crizotinib and risperidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• ritonavir

  Monitor Closely (2)ritonavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of ritonavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rivaroxaban

  Monitor Closely (1)crizotinib increases levels of rivaroxaban by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• romidepsin

  Monitor Closely (3)crizotinib increases levels of romidepsin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib and romidepsin both increase QTc interval. Use Caution/Monitor.

• rucaparib

  Monitor Closely (1)rucaparib will increase the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• salmeterol

  Monitor Closely (1)crizotinib and salmeterol both increase QTc interval. Use Caution/Monitor.

• saquinavir

  Contraindicated (1)crizotinib and saquinavir both increase QTc interval. Contraindicated.Monitor Closely (2)saquinavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of saquinavir by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• sarecycline

  Monitor Closely (1)sarecycline will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor for toxicities of P-gp substrates that may require dosage reduction when coadministered with P-gp inhibitors.

• saxagliptin

  Monitor Closely (1)crizotinib increases levels of saxagliptin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• selpercatinib

  Monitor Closely (1)selpercatinib increases toxicity of crizotinib by QTc interval. Use Caution/Monitor.

• selumetinib

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

• sevoflurane

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

• sildenafil

  Serious - Use Alternative (1)crizotinib increases levels of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid use of strong CYP3A4 inhibitors. If concomitant use of strong CYP3A inhibitors is unavoidable, reduce crizotnib to 250 mg PO qDay. After discontinuation of a strong CYP3A inhibitor, resume crizotinib dose used prior to initiating the strong CYP3A4 inhibitor.

• silodosin

  Monitor Closely (2)crizotinib increases levels of silodosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of silodosin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• simvastatin

  Monitor Closely (1)crizotinib increases levels of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• siponimod

  Monitor Closely (1)siponimod and crizotinib 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)crizotinib 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.
  
  crizotinib and siponimod both increase QTc interval. Avoid or Use Alternate Drug.

• sirolimus

  Monitor Closely (2)crizotinib increases levels of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.
  
  crizotinib increases levels of sirolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sitagliptin

  Monitor Closely (1)crizotinib increases levels of sitagliptin by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sodium bicarbonate

  Monitor Closely (1)sodium bicarbonate decreases levels of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Use Caution/Monitor. Drugs that elevate the gastric pH may decrease the solubility of crizotinib and subsequently reduce its bioavailability. However, no formal studies have been conducted. .

• sodium zirconium cyclosilicate

  Monitor Closely (1)sodium zirconium cyclosilicate will decrease the level or effect of crizotinib by increasing gastric pH. Applies only to oral form of both agents. Modify Therapy/Monitor Closely. Check specific recommendations for drugs that exhibit pH-dependent solubility that may affect their systemic exposure and efficacy. In general, administer drugs at least 2 hr before or after sodium zirconium cyclosilicate.

• solifenacin

  Monitor Closely (1)crizotinib increases levels of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)crizotinib and solifenacin both increase QTc interval. Avoid or Use Alternate Drug.

• sonidegib

  Monitor Closely (1)crizotinib will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid coadministration of sonidegib with moderate CYP3A4 inhibitors. If a moderate CYP3A inhibitor must be used, administer the moderate CYP3A inhibitor for <14 days and monitor closely for adverse reactions, particularly musculoskeletal adverse reactions.

• sorafenib

  Monitor Closely (1)sorafenib and crizotinib both increase QTc interval. Use Caution/Monitor.

• sotalol

  Monitor Closely (1)crizotinib and sotalol both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• sotorasib

  Serious - Use Alternative (1)sotorasib will decrease the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If use is unavoidable, refer to the prescribing information of the P-gp substrate for dosage modifications.

• St John's Wort

  Monitor Closely (1)St John's Wort decreases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inducers should be avoided. .

• stiripentol

  Monitor Closely (2)stiripentol, crizotinib. 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.
  
  stiripentol will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Modify Therapy/Monitor Closely. Consider reducing the dose of P-glycoprotein (P-gp) substrates, if adverse reactions are experienced when administered concomitantly with stiripentol.

• sufentanil

  Monitor Closely (1)crizotinib increases levels of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• sufentanil SL

  Monitor Closely (1)crizotinib 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)crizotinib increases effects of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and sunitinib both increase QTc interval. Avoid or Use Alternate Drug.

• suvorexant

  Monitor Closely (1)crizotinib will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease suvorexant starting dose to 5 mg HS if coadministered with moderate CYP3A4 inhibitors

• tacrolimus

  Monitor Closely (1)crizotinib increases levels of tacrolimus by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (2)crizotinib increases levels of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib and tacrolimus both increase QTc interval. Avoid or Use Alternate Drug.

• tadalafil

  Monitor Closely (1)crizotinib increases levels of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tamoxifen

  Monitor Closely (1)crizotinib, tamoxifen. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inhibition decreases metabolism of tamoxifen to N-desmethyl tamoxifen (active metabolite with similar biologic activity).

• tamsulosin

  Monitor Closely (1)crizotinib increases levels of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tazemetostat

  Monitor Closely (1)tazemetostat will decrease the level or effect of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)crizotinib 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 crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• telavancin

  Monitor Closely (1)crizotinib and telavancin both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• temsirolimus

  Monitor Closely (1)crizotinib increases levels of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• teniposide

  Monitor Closely (2)crizotinib increases levels of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of teniposide by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• tepotinib

  Serious - Use Alternative (1)tepotinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If concomitant use unavoidable, reduce the P-gp substrate dosage if recommended in its approved product labeling.

• tetrabenazine

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

• tezacaftor

  Monitor Closely (1)crizotinib 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

  Monitor Closely (1)crizotinib increases levels of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of crizotinib with CYP3A substrates with narrow therapeutic indices should be avoided.

• thioridazine

  Contraindicated (1)crizotinib and thioridazine both increase QTc interval. Contraindicated. Thioridazine is contraindicated with drugs that may prolong the QT interval.

• thiothixene

  Monitor Closely (1)crizotinib and thiothixene both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• tiagabine

  Monitor Closely (1)crizotinib increases levels of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tinidazole

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

• tipranavir

  Monitor Closely (1)tipranavir increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. .

• tofacitinib

  Monitor Closely (1)crizotinib increases levels of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No specific dose adjustment recommended when tofacitinib coadministered with moderate CYP3A4 inhibitors; decrease tofacitinib dose if coadministered with both moderate CYP3A4 and potent CYP2C19 inhibitors.

• tolterodine

  Monitor Closely (1)crizotinib increases levels of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• tolvaptan

  Monitor Closely (1)crizotinib increases levels of tolvaptan by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• topotecan

  Serious - Use Alternative (1)crizotinib will increase the level or effect of topotecan by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. Product labeling for PO topotecan recommends avoiding concomitant use of P-gp inhibitors; the interaction with IV topotecan may be less severe but is still likely of clinical significance

• toremifene

  Monitor Closely (1)crizotinib and toremifene both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• trabectedin

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

• tramadol

  Monitor Closely (1)crizotinib increases levels of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• trazodone

  Monitor Closely (1)crizotinib increases levels of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.Serious - Use Alternative (1)crizotinib and trazodone both increase QTc interval. Avoid or Use Alternate Drug.

• triazolam

  Monitor Closely (1)crizotinib increases levels of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• triclabendazole

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

• trimipramine

  Monitor Closely (2)crizotinib and trimipramine both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.
  
  crizotinib increases levels of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• triptorelin

  Monitor Closely (1)triptorelin increases toxicity of crizotinib by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.

• tucatinib

  Monitor Closely (1)tucatinib will increase the level or effect of crizotinib by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Consider reducing the dosage of P-gp substrates, where minimal concentration changes may lead to serious or life-threatening toxicities.Serious - Use Alternative (1)tucatinib will increase the level or effect of crizotinib 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.

• umeclidinium bromide/vilanterol inhaled

  Serious - Use Alternative (1)crizotinib increases toxicity of umeclidinium bromide/vilanterol inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.

• valbenazine

  Monitor Closely (1)valbenazine and crizotinib both increase QTc interval. Use Caution/Monitor.

• vandetanib

  Monitor Closely (1)crizotinib and vandetanib both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• vardenafil

  Monitor Closely (1)crizotinib increases levels of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and vardenafil both increase QTc interval. Avoid or Use Alternate Drug.

• vemurafenib

  Monitor Closely (1)crizotinib and vemurafenib both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• venetoclax

  Serious - Use Alternative (2)crizotinib will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a moderate CYP3A inhibitor must be used, reduce the venetoclax dose by at least 50%. Monitor more closely for signs of venetoclax toxicities.
  
  crizotinib will increase the level or effect of venetoclax by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If a P-gp inhibitor must be used, reduce the venetoclax dose by at least 50%. Monitor more closely for signs of venetoclax toxicities.

• verapamil

  Monitor Closely (3)crizotinib increases levels of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of verapamil by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  verapamil increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

• vilanterol/fluticasone furoate inhaled

  Serious - Use Alternative (1)crizotinib increases toxicity of vilanterol/fluticasone furoate inhaled by QTc interval. Avoid or Use Alternate Drug. Exercise extreme caution when vilanterol coadministered with drugs that prolong QTc interval; adrenergic agonist effects on the cardiovascular system may be potentiated.

• vinblastine

  Monitor Closely (2)crizotinib increases levels of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vinblastine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vincristine

  Monitor Closely (2)crizotinib increases levels of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vincristine by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vincristine liposomal

  Monitor Closely (2)crizotinib increases levels of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.
  
  crizotinib increases levels of vincristine liposomal by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vinorelbine

  Monitor Closely (1)crizotinib increases levels of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• voclosporin

  Monitor Closely (2)voclosporin, crizotinib. Either increases effects of the other by QTc interval. Use Caution/Monitor.
  
  crizotinib 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.

• voriconazole

  Monitor Closely (1)voriconazole increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use of strong CYP3A inhibitors should be avoided. ECG monitoring is recommended, along with drugs that may prolong the QT interval.Serious - Use Alternative (1)crizotinib and voriconazole both increase QTc interval. Avoid or Use Alternate Drug.

• vorinostat

  Monitor Closely (1)crizotinib and vorinostat both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• voxelotor

  Serious - Use Alternative (1)voxelotor will increase the level or effect of crizotinib 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.

• zanubrutinib

  Monitor Closely (1)crizotinib will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib dose when coadministered with a moderate CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib. See zanubrutinib Dosage Modifications for precise recommendation.

• ziprasidone

  Monitor Closely (1)crizotinib and ziprasidone both increase QTc interval. Use Caution/Monitor. ECG monitoring is recommended, along with drugs that may prolong the QT interval.

• zolpidem

  Monitor Closely (1)crizotinib increases levels of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

• zonisamide

  Monitor Closely (1)crizotinib increases levels of zonisamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.