Drug interactions
Ondansetron + Topiramate
Severity: Minor
Ondansetron and Topiramate: 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
Topiramate is a weak CYP3A4 inducer at higher doses and might slightly reduce ondansetron levels. The effect is unlikely to be clinically important.
What this interaction means in plain words
Ondansetron and Topiramate 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; Topiramate belongs to Central Nervous System.
Why it happens
Topiramate weakly induces CYP3A4, modestly increasing ondansetron metabolism.
What to do
No routine adjustment is needed. Reassess antiemetic response if nausea persists and titrate ondansetron as appropriate.
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 Topiramate
Frequently asked questions
Can I take Ondansetron with Topiramate?
MediHelp rates the interaction as minor. Ondansetron and Topiramate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Topiramate is a weak CYP3A4 inducer at higher doses and might slightly reduce ondansetron levels. The effect is unlikely to be clinically important.
How serious is the interaction between Ondansetron and Topiramate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine adjustment is needed. Reassess antiemetic response if nausea persists and titrate ondansetron as appropriate.
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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