Drug interactions
Pimozide + Tropisetron
Severity: Major
Pimozide and Tropisetron: 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
Tropisetron, a 5-HT3 antagonist, can modestly prolong the QT interval and may add to pimozide's strong effect. This raises the risk of torsades de pointes.
What this interaction means in plain words
Pimozide and Tropisetron 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
Additive QT interval prolongation.
What to do
Choose a non-QT-prolonging antiemetic where possible. If combined, monitor ECG and correct 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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Other interactions of Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Frequently asked questions
Can I take Pimozide with Tropisetron?
MediHelp rates the interaction as major. Pimozide and Tropisetron 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. Tropisetron, a 5-HT3 antagonist, can modestly prolong the QT interval and may add to pimozide's strong effect. This raises the risk of torsades de pointes.
How serious is the interaction between Pimozide and Tropisetron?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Choose a non-QT-prolonging antiemetic where possible. If combined, monitor ECG and correct electrolytes.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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