Drug interactions
Darifenacin + Donepezil
Severity: Moderate
Darifenacin and Donepezil: 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 cholinergic activity while darifenacin blocks muscarinic receptors, so their effects oppose each other. This may reduce the benefit of both drugs. Donepezil can also cause urinary urgency, which darifenacin may be prescribed to treat.
What this interaction means in plain words
Darifenacin and Donepezil 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.
Darifenacin belongs to Genitourinary; Donepezil belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between a cholinesterase inhibitor and a muscarinic antagonist.
What to do
Avoid the combination if possible and reassess whether urinary symptoms are caused by donepezil. Monitor cognition and bladder symptoms if both are required.
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 Darifenacin
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 Darifenacin with Donepezil?
MediHelp rates the interaction as moderate. Darifenacin and Donepezil 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 cholinergic activity while darifenacin blocks muscarinic receptors, so their effects oppose each other. This may reduce the benefit of both drugs. Donepezil can also cause urinary urgency, which darifenacin may be prescribed to treat.
How serious is the interaction between Darifenacin and Donepezil?
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 if possible and reassess whether urinary symptoms are caused by donepezil. Monitor cognition and bladder symptoms if both are required.
What other medicines interact with Darifenacin?
MediHelp also lists interactions of Darifenacin with, for example, Atazanavir, Bethanechol, Clarithromycin. The full list is on the Darifenacin page.
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