Drug interactions
Amoxapine + Ondansetron
Severity: Major
Amoxapine and Ondansetron: major 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
Amoxapine can prolong the QT interval and ondansetron adds to this effect, raising arrhythmia risk. Both also have serotonergic activity, so serotonin syndrome is a rare additional concern.
What this interaction means in plain words
Amoxapine and Ondansetron can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive QT prolongation, with possible additive serotonergic effects.
What to do
Prefer an antiemetic without QT or serotonergic effects. If combined, check ECG and electrolytes and watch for serotonin toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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
Frequently asked questions
Can I take Amoxapine with Ondansetron?
MediHelp rates the interaction as major. Amoxapine and Ondansetron can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Amoxapine can prolong the QT interval and ondansetron adds to this effect, raising arrhythmia risk. Both also have serotonergic activity, so serotonin syndrome is a rare additional concern.
How serious is the interaction between Amoxapine and Ondansetron?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an antiemetic without QT or serotonergic effects. If combined, check ECG and electrolytes and watch for serotonin toxicity.
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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