Drug interactions
Memantine-donepezil + Tolterodine
Severity: Moderate
Memantine-donepezil and Tolterodine: 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
Tolterodine blocks muscarinic receptors, which counteracts the cholinergic action of donepezil. This may reduce the cognitive benefit of donepezil and the bladder benefit of tolterodine, and anticholinergics may worsen confusion in dementia.
What this interaction means in plain words
Memantine-donepezil and Tolterodine 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; Tolterodine belongs to Genitourinary.
Why it happens
Pharmacodynamic antagonism between a cholinesterase inhibitor and an antimuscarinic.
What to do
Avoid the combination where possible and consider a non-anticholinergic option for overactive bladder, such as mirabegron. If used together, 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 Tolterodine
Frequently asked questions
Can I take Memantine-donepezil with Tolterodine?
MediHelp rates the interaction as moderate. Memantine-donepezil and Tolterodine 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. Tolterodine blocks muscarinic receptors, which counteracts the cholinergic action of donepezil. This may reduce the cognitive benefit of donepezil and the bladder benefit of tolterodine, and anticholinergics may worsen confusion in dementia.
How serious is the interaction between Memantine-donepezil and Tolterodine?
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 the combination where possible and consider a non-anticholinergic option for overactive bladder, such as mirabegron. If used together, 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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