Drug interactions
Granisetron + Ibutilide
Severity: Major
Granisetron and Ibutilide: 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
Ibutilide has a high risk of causing torsades de pointes, and granisetron adds further QT-prolonging effect. The combination may substantially increase the risk of life-threatening arrhythmia.
What this interaction means in plain words
Granisetron and Ibutilide 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.
Granisetron belongs to Gastrointestinal Tract; Ibutilide belongs to Cardiovascular.
Why it happens
Additive pharmacodynamic QT prolongation through potassium channel blockade.
What to do
Avoid giving granisetron around ibutilide administration and use another antiemetic. If unavoidable, maintain continuous ECG monitoring and correct potassium and magnesium.
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
Other interactions of Ibutilide
- Amiodarone + Ibutilide Contraindicated
- Amisulpride + Ibutilide Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Clarithromycin + Ibutilide Contraindicated
- Desipramine + Ibutilide Contraindicated
- Dolasetron + Ibutilide Contraindicated
Frequently asked questions
Can I take Granisetron with Ibutilide?
MediHelp rates the interaction as major. Granisetron and Ibutilide 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. Ibutilide has a high risk of causing torsades de pointes, and granisetron adds further QT-prolonging effect. The combination may substantially increase the risk of life-threatening arrhythmia.
How serious is the interaction between Granisetron and Ibutilide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid giving granisetron around ibutilide administration and use another antiemetic. If unavoidable, maintain continuous ECG monitoring and correct potassium and magnesium.
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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