Drug interactions
Granisetron + Procainamide
Severity: Major
Granisetron and Procainamide: major interaction.
Last updated Sources: US FDA label
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
Procainamide is a class Ia antiarrhythmic with a well-established risk of QT prolongation and torsades de pointes. Granisetron may add to this effect, increasing the chance of dangerous arrhythmia.
What this interaction means in plain words
Granisetron and Procainamide 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 prolongation of the QT interval through potassium channel blockade and related effects.
What to do
Prefer a non-QT-prolonging antiemetic. If granisetron is essential, monitor ECG continuously or frequently and keep potassium and magnesium normal.
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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Frequently asked questions
Can I take Granisetron with Procainamide?
MediHelp rates the interaction as major. Granisetron and Procainamide 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. Procainamide is a class Ia antiarrhythmic with a well-established risk of QT prolongation and torsades de pointes. Granisetron may add to this effect, increasing the chance of dangerous arrhythmia.
How serious is the interaction between Granisetron and Procainamide?
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 a non-QT-prolonging antiemetic. If granisetron is essential, monitor ECG continuously or frequently and keep potassium and magnesium normal.
What other medicines interact with Granisetron?
MediHelp also lists interactions of Granisetron with, for example, Apomorphine, Amiodarone, Amisulpride. The full list is on the Granisetron page.
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