Drug interactions
Ceritinib + Quinidine
Severity: Major
Ceritinib and Quinidine: major interaction.
Last updated Sources: UK SmPC
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
Ceritinib prolongs QT and inhibits CYP3A4, and quinidine is a CYP3A substrate with a narrow therapeutic window. Combined use raises the risk of QT prolongation and torsades de pointes.
What this interaction means in plain words
Ceritinib and Quinidine 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.
Ceritinib belongs to Oncology; Quinidine belongs to Anti Parasitic.
Why it happens
Additive QT prolongation, with ceritinib CYP3A inhibition and quinidine inhibition of CYP3A4 and P-glycoprotein raising exposure of each.
What to do
Avoid if possible. If necessary, monitor ECG and electrolytes frequently and watch for toxicity of either drug.
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 Quinidine
- Adagrasib + Quinidine Contraindicated
- Arsenic trioxide + Quinidine Contraindicated
- Artemether / lumefantrine + Quinidine Contraindicated
- Chloroquine + Quinidine Contraindicated
- Dofetilide + Quinidine Contraindicated
- Dronedarone + Quinidine Contraindicated
Other interactions of Ceritinib
- Ceritinib + Cisapride Contraindicated
- Ceritinib + Eletriptan Contraindicated
- Ceritinib + Flibanserin Contraindicated
- Ceritinib + Pimozide Contraindicated
- Ceritinib + Thioridazine Contraindicated
- Ceritinib + Tolvaptan Contraindicated
Frequently asked questions
Can I take Ceritinib with Quinidine?
MediHelp rates the interaction as major. Ceritinib and Quinidine 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. Ceritinib prolongs QT and inhibits CYP3A4, and quinidine is a CYP3A substrate with a narrow therapeutic window. Combined use raises the risk of QT prolongation and torsades de pointes.
How serious is the interaction between Ceritinib and Quinidine?
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 necessary, monitor ECG and electrolytes frequently and watch for toxicity of either drug.
What other medicines interact with Quinidine?
MediHelp also lists interactions of Quinidine with, for example, Adagrasib, Arsenic trioxide, Artemether / lumefantrine. The full list is on the Quinidine page.
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