Drug interactions
Crizotinib + Nefazodone
Severity: Major
Crizotinib and Nefazodone: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Nefazodone is a strong CYP3A4 inhibitor and can raise crizotinib exposure substantially. Higher crizotinib levels increase the risk of adverse effects such as QT prolongation, hepatotoxicity, bradycardia and visual disturbances.
What this interaction means in plain words
Crizotinib and Nefazodone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Nefazodone inhibits CYP3A4-mediated metabolism of crizotinib, reducing its clearance.
What to do
Avoid the combination where possible and choose an antidepressant that does not inhibit CYP3A4. If it cannot be avoided, monitor ECG, electrolytes and liver function and consider reducing the crizotinib dose per labeling.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Crizotinib and Nefazodone, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
References
Other interactions of Crizotinib
- Crizotinib + Flibanserin Contraindicated
- Crizotinib + Lomitapide Contraindicated
- Crizotinib + Lonafarnib Contraindicated
- Crizotinib + Pimozide Contraindicated
- Crizotinib + Saquinavir Contraindicated
- Crizotinib + Thioridazine Contraindicated
Frequently asked questions
Can I take Crizotinib with Nefazodone?
MediHelp rates the interaction as major. Crizotinib and Nefazodone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Nefazodone is a strong CYP3A4 inhibitor and can raise crizotinib exposure substantially. Higher crizotinib levels increase the risk of adverse effects such as QT prolongation, hepatotoxicity, bradycardia and visual disturbances.
How serious is the interaction between Crizotinib and Nefazodone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible and choose an antidepressant that does not inhibit CYP3A4. If it cannot be avoided, monitor ECG, electrolytes and liver function and consider reducing the crizotinib dose per labeling.
What other medicines interact with Crizotinib?
MediHelp also lists interactions of Crizotinib with, for example, Flibanserin, Lomitapide, Lonafarnib. The full list is on the Crizotinib page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
