Drug interactions
Donepezil + Ondansetron
Severity: Moderate
Donepezil and Ondansetron: 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 can prolong the QT interval, and donepezil has also been associated with bradycardia and torsades de pointes. Combined use may add to arrhythmia risk in older patients.
What this interaction means in plain words
Donepezil and Ondansetron 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.
Donepezil belongs to Central Nervous System; Ondansetron belongs to Gastrointestinal Tract.
Why it happens
Additive QT prolongation; donepezil also slows heart rate through cholinergic effects.
What to do
Check electrolytes and consider a baseline ECG in older patients or those with cardiac disease. Use a non-QT-prolonging antiemetic if risk factors are present.
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 Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Other interactions of Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
Frequently asked questions
Can I take Donepezil with Ondansetron?
MediHelp rates the interaction as moderate. Donepezil and Ondansetron 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 can prolong the QT interval, and donepezil has also been associated with bradycardia and torsades de pointes. Combined use may add to arrhythmia risk in older patients.
How serious is the interaction between Donepezil and Ondansetron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check electrolytes and consider a baseline ECG in older patients or those with cardiac disease. Use a non-QT-prolonging antiemetic if risk factors are present.
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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