Drug interactions
Granisetron + Sumatriptan
Severity: Moderate
Granisetron and Sumatriptan: 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 influence serotonin pathways and serotonin syndrome has been reported with triptans and 5-HT3 antagonists. The absolute risk is low, and they are often used together for migraine with nausea.
What this interaction means in plain words
Granisetron and Sumatriptan 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; Sumatriptan belongs to Central Nervous System.
Why it happens
Possible additive serotonergic effects, with a mechanism that is not clearly established.
What to do
Use together at standard doses if needed and advise the patient to report agitation, tremor, sweating or fever. Stop both and seek care if symptoms of serotonin toxicity develop.
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 Sumatriptan
- Almotriptan + Sumatriptan Contraindicated
- Dihydroergotamine intranasal + Sumatriptan Contraindicated
- Dihydroergotamine + Sumatriptan Contraindicated
- Eletriptan + Sumatriptan Contraindicated
- Ergoloid mesylates + Sumatriptan Contraindicated
- Ergotamine + Sumatriptan Contraindicated
Frequently asked questions
Can I take Granisetron with Sumatriptan?
MediHelp rates the interaction as moderate. Granisetron and Sumatriptan 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 influence serotonin pathways and serotonin syndrome has been reported with triptans and 5-HT3 antagonists. The absolute risk is low, and they are often used together for migraine with nausea.
How serious is the interaction between Granisetron and Sumatriptan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use together at standard doses if needed and advise the patient to report agitation, tremor, sweating or fever. Stop both and seek care if symptoms of serotonin toxicity develop.
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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