Drug interactions
Donepezil + Marijuana
Severity: Minor
Donepezil and Marijuana: 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
Cannabis constituents inhibit CYP2D6 and CYP3A4 in vitro, which could slightly raise donepezil levels. Clinical evidence is lacking and the effect is likely small, though cannabis may add sedation or tachycardia.
What this interaction means in plain words
Donepezil and Marijuana have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Possible in vitro inhibition of CYP2D6 and CYP3A4 by cannabinoids; clinical relevance not established.
What to do
No dose adjustment required; monitor for excess sedation, bradycardia or GI effects.
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 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 Marijuana?
MediHelp rates the interaction as minor. Donepezil and Marijuana have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Cannabis constituents inhibit CYP2D6 and CYP3A4 in vitro, which could slightly raise donepezil levels. Clinical evidence is lacking and the effect is likely small, though cannabis may add sedation or tachycardia.
How serious is the interaction between Donepezil and Marijuana?
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 dose adjustment required; monitor for excess sedation, bradycardia or GI effects.
What other medicines interact with Donepezil?
MediHelp also lists interactions of Donepezil with, for example, Dronedarone, Pimozide, Thioridazine. The full list is on the Donepezil page.
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