Drug interactions
Dofetilide + Dolasetron
Severity: Contraindicated
Dofetilide and Dolasetron: 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
Dofetilide has a narrow therapeutic window with a dose-related risk of torsades de pointes, and dolasetron adds further QT, QRS and PR prolongation. The combination may precipitate life-threatening ventricular arrhythmia.
What this interaction means in plain words
Dofetilide and Dolasetron 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.
Dofetilide belongs to Cardiovascular; Dolasetron belongs to Gastrointestinal Tract.
Why it happens
Additive prolongation of cardiac repolarization through potassium channel blockade, on top of dofetilide's potent IKr inhibition.
What to do
Avoid the combination and use an antiemetic without QT effects, such as a non-serotonergic agent, in patients receiving dofetilide.
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
- Dolasetron + Ibutilide Contraindicated
- Dolasetron + Pimozide Contraindicated
- Dolasetron + Thioridazine Contraindicated
- Dolasetron + Vandetanib Contraindicated
- Dolasetron + Ziprasidone Contraindicated
Other interactions of Dofetilide
- Amiodarone + Dofetilide Contraindicated
- Amisulpride + Dofetilide Contraindicated
- Amlodipine-hydrochlorothiazide-valsartan + Dofetilide Contraindicated
- Amlodipine-olmesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Captopril-hydrochlorothiazide + Dofetilide Contraindicated
Frequently asked questions
Can I take Dofetilide with Dolasetron?
MediHelp rates the interaction as contraindicated. Dofetilide and Dolasetron 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. Dofetilide has a narrow therapeutic window with a dose-related risk of torsades de pointes, and dolasetron adds further QT, QRS and PR prolongation. The combination may precipitate life-threatening ventricular arrhythmia.
How serious is the interaction between Dofetilide and Dolasetron?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and use an antiemetic without QT effects, such as a non-serotonergic agent, in patients receiving dofetilide.
What other medicines interact with Dolasetron?
MediHelp also lists interactions of Dolasetron with, for example, Apomorphine, Ibutilide, Pimozide. The full list is on the Dolasetron page.
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