Drug interactions
Donepezil + Tolterodine
Severity: Moderate
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
Donepezil increases acetylcholine availability, while tolterodine blocks muscarinic receptors, so each can reduce the benefit of the other. Tolterodine may blunt the cognitive benefit of donepezil and may worsen confusion in dementia. Bladder symptoms can also persist, since donepezil may contribute to urinary urgency or incontinence.
What this interaction means in plain words
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.
Donepezil belongs to Central Nervous System; Tolterodine belongs to Genitourinary.
Why it happens
Pharmacodynamic opposition between a cholinesterase inhibitor and a muscarinic antagonist.
What to do
Avoid the combination where possible and review whether the bladder symptoms are driven by donepezil. If an antimuscarinic is needed, monitor cognition and function and consider a non-pharmacological approach or a less brain-penetrant agent.
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 Tolterodine
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 Tolterodine?
MediHelp rates the interaction as moderate. 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. Donepezil increases acetylcholine availability, while tolterodine blocks muscarinic receptors, so each can reduce the benefit of the other. Tolterodine may blunt the cognitive benefit of donepezil and may worsen confusion in dementia. Bladder symptoms can also persist, since donepezil may contribute to urinary urgency or incontinence.
How serious is the interaction between 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 review whether the bladder symptoms are driven by donepezil. If an antimuscarinic is needed, monitor cognition and function and consider a non-pharmacological approach or a less brain-penetrant agent.
What other medicines interact with Tolterodine?
MediHelp also lists interactions of Tolterodine with, for example, Clarithromycin, Clozapine, Cobicistat. The full list is on the Tolterodine page.
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