Drug interactions
Dolasetron + Perphenazine
Severity: Major
Dolasetron and Perphenazine: major interaction.
Last updated Sources: Health Canada product monograph
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
Perphenazine and dolasetron both lengthen the QT interval, so combined use raises the risk of torsades de pointes. The risk is greater with electrolyte disturbances or cardiac disease.
What this interaction means in plain words
Dolasetron and Perphenazine 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.
Dolasetron belongs to Gastrointestinal Tract; Perphenazine belongs to Central Nervous System.
Why it happens
Additive blockade of cardiac potassium channels leading to QT prolongation.
What to do
Prefer an antiemetic without QT liability. If used together, obtain baseline ECG, correct electrolytes and monitor QTc.
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 Dolasetron
- Apomorphine + Dolasetron Contraindicated
- Dofetilide + Dolasetron Contraindicated
- Dolasetron + Ibutilide Contraindicated
- Dolasetron + Pimozide Contraindicated
- Dolasetron + Thioridazine Contraindicated
- Dolasetron + Vandetanib Contraindicated
Other interactions of Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Dolasetron with Perphenazine?
MediHelp rates the interaction as major. Dolasetron and Perphenazine 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. Perphenazine and dolasetron both lengthen the QT interval, so combined use raises the risk of torsades de pointes. The risk is greater with electrolyte disturbances or cardiac disease.
How serious is the interaction between Dolasetron and Perphenazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an antiemetic without QT liability. If used together, obtain baseline ECG, correct electrolytes and monitor QTc.
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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