Drug interactions
Carbamazepine + Ondansetron
Severity: Minor
Carbamazepine and Ondansetron: 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
Carbamazepine is a potent enzyme inducer and can speed ondansetron elimination, lowering its exposure. This may blunt antiemetic efficacy, though the effect is usually modest.
What this interaction means in plain words
Carbamazepine and Ondansetron have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Carbamazepine belongs to Central Nervous System; Ondansetron belongs to Gastrointestinal Tract.
Why it happens
Induction of CYP3A4 and CYP1A2 by carbamazepine increases ondansetron metabolism.
What to do
No routine dose adjustment is needed; monitor for nausea and vomiting control and consider a higher dose or alternative agent if breakthrough occurs.
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 Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Ondansetron?
MediHelp rates the interaction as minor. Carbamazepine and Ondansetron have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Carbamazepine is a potent enzyme inducer and can speed ondansetron elimination, lowering its exposure. This may blunt antiemetic efficacy, though the effect is usually modest.
How serious is the interaction between Carbamazepine and Ondansetron?
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 dose adjustment is needed; monitor for nausea and vomiting control and consider a higher dose or alternative agent if breakthrough occurs.
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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