Drug interactions
Granisetron + Rizatriptan
Severity: Moderate
Granisetron and Rizatriptan: 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
Both drugs act on serotonin pathways and serotonin syndrome has been reported with triptans and 5-HT3 antagonists. The absolute risk is low, and both are commonly used together for migraine with nausea.
What this interaction means in plain words
Granisetron and Rizatriptan 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; Rizatriptan belongs to Central Nervous System.
Why it happens
Possible additive serotonergic effects, although the mechanism is not clearly established.
What to do
Co-use is generally acceptable at standard doses. Counsel the patient to report agitation, tremor, sweating, diarrhoea or fever promptly.
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 Rizatriptan
- Almotriptan + Rizatriptan Contraindicated
- Dihydroergotamine intranasal + Rizatriptan Contraindicated
- Dihydroergotamine + Rizatriptan Contraindicated
- Eletriptan + Rizatriptan Contraindicated
- Ergoloid mesylates + Rizatriptan Contraindicated
- Ergotamine + Rizatriptan Contraindicated
Frequently asked questions
Can I take Granisetron with Rizatriptan?
MediHelp rates the interaction as moderate. Granisetron and Rizatriptan 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. Both drugs act on serotonin pathways and serotonin syndrome has been reported with triptans and 5-HT3 antagonists. The absolute risk is low, and both are commonly used together for migraine with nausea.
How serious is the interaction between Granisetron and Rizatriptan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Co-use is generally acceptable at standard doses. Counsel the patient to report agitation, tremor, sweating, diarrhoea or fever promptly.
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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