Drug interactions
Ondansetron + Zolmitriptan
Severity: Minor
Ondansetron and Zolmitriptan: minor 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 agents act on serotonin pathways and serotonin syndrome has been reported with 5-HT3 antagonists plus triptans. Documented cases are rare and the risk is considered low.
What this interaction means in plain words
Ondansetron and Zolmitriptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Ondansetron belongs to Gastrointestinal Tract; Zolmitriptan belongs to Central Nervous System.
Why it happens
Theoretical additive serotonergic effect; the mechanism is not firmly established.
What to do
Co-use is generally acceptable; tell patients to report agitation, sweating, tremor or fever. Stop both drugs if serotonin toxicity is suspected.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Other interactions of Zolmitriptan
- Almotriptan + Zolmitriptan Contraindicated
- Dihydroergotamine intranasal + Zolmitriptan Contraindicated
- Dihydroergotamine + Zolmitriptan Contraindicated
- Eletriptan + Zolmitriptan Contraindicated
- Ergoloid mesylates + Zolmitriptan Contraindicated
- Ergotamine + Zolmitriptan Contraindicated
Frequently asked questions
Can I take Ondansetron with Zolmitriptan?
MediHelp rates the interaction as minor. Ondansetron and Zolmitriptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Both agents act on serotonin pathways and serotonin syndrome has been reported with 5-HT3 antagonists plus triptans. Documented cases are rare and the risk is considered low.
How serious is the interaction between Ondansetron and Zolmitriptan?
MediHelp rates it minor, 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; tell patients to report agitation, sweating, tremor or fever. Stop both drugs if serotonin toxicity is suspected.
What other medicines interact with Ondansetron?
MediHelp also lists interactions of Ondansetron with, for example, Apomorphine, Thioridazine, Vandetanib. The full list is on the Ondansetron page.
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