Drug interactions
Crizotinib + Tucatinib
Severity: Major
Crizotinib and Tucatinib: major interaction.
Last updated
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
Tucatinib inhibits CYP3A4 and may raise crizotinib concentrations, since crizotinib is a CYP3A substrate. Higher exposure could increase hepatotoxicity, QT prolongation and bradycardia.
What this interaction means in plain words
Crizotinib and Tucatinib 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.
Crizotinib belongs to Oncology; Tucatinib belongs to Oncology.
Why it happens
Tucatinib inhibition of CYP3A4 reduces the metabolic clearance of crizotinib.
What to do
Avoid if possible; if needed, monitor ECG, heart rate and liver function and consider a crizotinib dose reduction.
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?
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Other interactions of Crizotinib
- Crizotinib + Flibanserin Contraindicated
- Crizotinib + Lomitapide Contraindicated
- Crizotinib + Lonafarnib Contraindicated
- Crizotinib + Pimozide Contraindicated
- Crizotinib + Saquinavir Contraindicated
- Crizotinib + Thioridazine Contraindicated
Other interactions of Tucatinib
- Cisapride + Tucatinib Contraindicated
- Eletriptan + Tucatinib Contraindicated
- Ergotamine + Tucatinib Contraindicated
- Flibanserin + Tucatinib Contraindicated
- Ranolazine + Tucatinib Contraindicated
- Amobarbital + Tucatinib Major
Frequently asked questions
Can I take Crizotinib with Tucatinib?
MediHelp rates the interaction as major. Crizotinib and Tucatinib 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. Tucatinib inhibits CYP3A4 and may raise crizotinib concentrations, since crizotinib is a CYP3A substrate. Higher exposure could increase hepatotoxicity, QT prolongation and bradycardia.
How serious is the interaction between Crizotinib and Tucatinib?
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 if possible; if needed, monitor ECG, heart rate and liver function and consider a crizotinib dose reduction.
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.
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