Drug interactions
Amiodarone + Lapatinib
Severity: Major
Amiodarone and Lapatinib: 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
Lapatinib can prolong the QT interval and amiodarone strongly does so as well, increasing the risk of torsades de pointes. Amiodarone may also modestly raise lapatinib exposure through CYP3A4 and P-glycoprotein effects.
What this interaction means in plain words
Amiodarone and Lapatinib 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.
Amiodarone belongs to Cardiovascular; Lapatinib belongs to Oncology.
Why it happens
Additive QT prolongation, plus possible inhibition of lapatinib metabolism and efflux by amiodarone.
What to do
Avoid combining where possible. If necessary, monitor ECG and electrolytes and watch for lapatinib toxicity such as diarrhea or hepatotoxicity.
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 Amiodarone
- Amiodarone + Amisulpride Contraindicated
- Amiodarone + Arsenic trioxide Contraindicated
- Amiodarone + Dofetilide Contraindicated
- Amiodarone + Dronedarone Contraindicated
- Amiodarone + Droperidol Contraindicated
- Amiodarone + Eliglustat Contraindicated
Other interactions of Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Frequently asked questions
Can I take Amiodarone with Lapatinib?
MediHelp rates the interaction as major. Amiodarone and Lapatinib 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. Lapatinib can prolong the QT interval and amiodarone strongly does so as well, increasing the risk of torsades de pointes. Amiodarone may also modestly raise lapatinib exposure through CYP3A4 and P-glycoprotein effects.
How serious is the interaction between Amiodarone and Lapatinib?
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 combining where possible. If necessary, monitor ECG and electrolytes and watch for lapatinib toxicity such as diarrhea or hepatotoxicity.
What other medicines interact with Amiodarone?
MediHelp also lists interactions of Amiodarone with, for example, Amisulpride, Arsenic trioxide, Dofetilide. The full list is on the Amiodarone page.
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