Drug interactions
Memantine-donepezil + Oxybutynin
Severity: Moderate
Memantine-donepezil and Oxybutynin: 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
Oxybutynin is an antimuscarinic that directly opposes the cholinergic action of donepezil, so both drugs may lose effectiveness. It may also worsen confusion and cognition in dementia patients.
What this interaction means in plain words
Memantine-donepezil and Oxybutynin 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.
Memantine-donepezil belongs to Central Nervous System; Oxybutynin belongs to Genitourinary.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Avoid oxybutynin where possible and consider non-anticholinergic bladder options such as a beta-3 agonist. If continued, monitor cognition and urinary symptoms.
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 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 Oxybutynin
Frequently asked questions
Can I take Memantine-donepezil with Oxybutynin?
MediHelp rates the interaction as moderate. Memantine-donepezil and Oxybutynin 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. Oxybutynin is an antimuscarinic that directly opposes the cholinergic action of donepezil, so both drugs may lose effectiveness. It may also worsen confusion and cognition in dementia patients.
How serious is the interaction between Memantine-donepezil and Oxybutynin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid oxybutynin where possible and consider non-anticholinergic bladder options such as a beta-3 agonist. If continued, monitor cognition and urinary symptoms.
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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