Drug interactions
Donepezil + Propantheline
Severity: Moderate
Donepezil and Propantheline: 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
Propantheline is an antimuscarinic and counteracts donepezil's cholinergic effects. The efficacy of both drugs may be reduced.
What this interaction means in plain words
Donepezil and Propantheline 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.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Avoid the combination where possible. If it is used, monitor cognition and the symptom response to each drug.
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 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 Propantheline?
MediHelp rates the interaction as moderate. Donepezil and Propantheline 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. Propantheline is an antimuscarinic and counteracts donepezil's cholinergic effects. The efficacy of both drugs may be reduced.
How serious is the interaction between Donepezil and Propantheline?
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. If it is used, monitor cognition and the symptom response to each drug.
What other medicines interact with Donepezil?
MediHelp also lists interactions of Donepezil with, for example, Dronedarone, Pimozide, Thioridazine. The full list is on the Donepezil page.
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