Drug interactions
Crizotinib + Ibutilide
Severity: Major
Crizotinib and Ibutilide: 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
Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Adding crizotinib, which also prolongs QT, further increases this risk.
What this interaction means in plain words
Crizotinib and Ibutilide 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; Ibutilide belongs to Cardiovascular.
Why it happens
Additive prolongation of cardiac repolarization via potassium channel effects.
What to do
Avoid the combination where possible; if ibutilide is essential, hold crizotinib and give ibutilide with continuous ECG monitoring and corrected electrolytes.
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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References
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 Ibutilide
- Amiodarone + Ibutilide Contraindicated
- Amisulpride + Ibutilide Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Clarithromycin + Ibutilide Contraindicated
- Desipramine + Ibutilide Contraindicated
- Dolasetron + Ibutilide Contraindicated
Frequently asked questions
Can I take Crizotinib with Ibutilide?
MediHelp rates the interaction as major. Crizotinib and Ibutilide 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. Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Adding crizotinib, which also prolongs QT, further increases this risk.
How serious is the interaction between Crizotinib and Ibutilide?
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; if ibutilide is essential, hold crizotinib and give ibutilide with continuous ECG monitoring and corrected electrolytes.
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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