Drug interactions
Granisetron + Risperidone
Severity: Moderate
Granisetron and Risperidone: moderate 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
Granisetron and risperidone each have the potential to prolong the QT interval, and combining them may raise the risk of ventricular arrhythmia. The concern is greatest in patients with cardiac disease, bradycardia or electrolyte abnormalities.
What this interaction means in plain words
Granisetron and Risperidone can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Granisetron belongs to Gastrointestinal Tract; Risperidone belongs to Central Nervous System.
Why it happens
Additive prolongation of cardiac repolarization through pharmacodynamic effects.
What to do
Check ECG and serum potassium and magnesium when starting the combination in at-risk patients. Use the lowest effective doses and review other QT-prolonging drugs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Granisetron with Risperidone?
MediHelp rates the interaction as moderate. Granisetron and Risperidone can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Granisetron and risperidone each have the potential to prolong the QT interval, and combining them may raise the risk of ventricular arrhythmia. The concern is greatest in patients with cardiac disease, bradycardia or electrolyte abnormalities.
How serious is the interaction between Granisetron and Risperidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check ECG and serum potassium and magnesium when starting the combination in at-risk patients. Use the lowest effective doses and review other QT-prolonging drugs.
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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