Drug interactions
Memantine-donepezil + Venlafaxine
Severity: Minor
Memantine-donepezil and Venlafaxine: 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
Venlafaxine is a weak CYP2D6 inhibitor and may modestly raise donepezil exposure. The clinical effect is generally small, though cholinergic adverse effects such as nausea or bradycardia may be slightly more likely.
What this interaction means in plain words
Memantine-donepezil and Venlafaxine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Memantine-donepezil belongs to Central Nervous System; Venlafaxine belongs to Central Nervous System.
Why it happens
Weak inhibition of CYP2D6-mediated donepezil metabolism by venlafaxine.
What to do
No routine dose change is needed. Monitor for nausea, diarrhea, and bradycardia after starting or increasing venlafaxine.
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 Memantine-donepezil
- Dronedarone + Memantine-donepezil Contraindicated
- Memantine-donepezil + Thioridazine Contraindicated
- Amantadine + Memantine-donepezil Major
- Amiodarone + Memantine-donepezil Major
- Amisulpride + Memantine-donepezil Major
- Amitriptyline + Memantine-donepezil Major
Other interactions of Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Frequently asked questions
Can I take Memantine-donepezil with Venlafaxine?
MediHelp rates the interaction as minor. Memantine-donepezil and Venlafaxine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Venlafaxine is a weak CYP2D6 inhibitor and may modestly raise donepezil exposure. The clinical effect is generally small, though cholinergic adverse effects such as nausea or bradycardia may be slightly more likely.
How serious is the interaction between Memantine-donepezil and Venlafaxine?
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 change is needed. Monitor for nausea, diarrhea, and bradycardia after starting or increasing venlafaxine.
What other medicines interact with Memantine-donepezil?
MediHelp also lists interactions of Memantine-donepezil with, for example, Dronedarone, Thioridazine, Amantadine. The full list is on the Memantine-donepezil page.
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