Drug interactions
Dolasetron + Pimozide
Severity: Contraindicated
Dolasetron and Pimozide: contraindicated 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
Pimozide markedly prolongs the QT interval and is associated with torsades de pointes, and dolasetron adds further QT and QRS prolongation. The combination may cause life-threatening ventricular arrhythmia.
What this interaction means in plain words
Dolasetron and Pimozide are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Dolasetron belongs to Gastrointestinal Tract; Pimozide belongs to Central Nervous System.
Why it happens
Additive prolongation of cardiac repolarization.
What to do
Do not combine; select an antiemetic without QT effect for patients on pimozide.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Dolasetron
- Apomorphine + Dolasetron Contraindicated
- Dofetilide + Dolasetron Contraindicated
- Dolasetron + Ibutilide Contraindicated
- Dolasetron + Thioridazine Contraindicated
- Dolasetron + Vandetanib Contraindicated
- Dolasetron + Ziprasidone Contraindicated
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 Dolasetron with Pimozide?
MediHelp rates the interaction as contraindicated. Dolasetron and Pimozide are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Pimozide markedly prolongs the QT interval and is associated with torsades de pointes, and dolasetron adds further QT and QRS prolongation. The combination may cause life-threatening ventricular arrhythmia.
How serious is the interaction between Dolasetron and Pimozide?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not combine; select an antiemetic without QT effect for patients on pimozide.
What other medicines interact with Dolasetron?
MediHelp also lists interactions of Dolasetron with, for example, Apomorphine, Dofetilide, Ibutilide. The full list is on the Dolasetron page.
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