Drug interactions
Granisetron + Naratriptan
Severity: Moderate
Granisetron and Naratriptan: 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 the serotonin system, and serotonin syndrome has been reported with 5-HT3 antagonists and triptans. The risk is low, and triptan use is intermittent.
What this interaction means in plain words
Granisetron and Naratriptan 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; Naratriptan belongs to Central Nervous System.
Why it happens
Theoretical additive serotonergic activity; the mechanism is not firmly established.
What to do
Counsel the patient to report agitation, tremor, sweating or fever. Stop both agents and treat supportively if serotonin syndrome develops.
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 Naratriptan
- Almotriptan + Naratriptan Contraindicated
- Dihydroergotamine intranasal + Naratriptan Contraindicated
- Dihydroergotamine + Naratriptan Contraindicated
- Eletriptan + Naratriptan Contraindicated
- Ergoloid mesylates + Naratriptan Contraindicated
- Ergotamine + Naratriptan Contraindicated
Frequently asked questions
Can I take Granisetron with Naratriptan?
MediHelp rates the interaction as moderate. Granisetron and Naratriptan 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 the serotonin system, and serotonin syndrome has been reported with 5-HT3 antagonists and triptans. The risk is low, and triptan use is intermittent.
How serious is the interaction between Granisetron and Naratriptan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel the patient to report agitation, tremor, sweating or fever. Stop both agents and treat supportively if serotonin syndrome develops.
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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