Drug interactions
Carbachol + Donepezil
Severity: Moderate
Carbachol 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
Carbachol is a direct cholinergic agonist and donepezil inhibits acetylcholinesterase, so cholinergic effects may be additive. Systemic exposure from ophthalmic carbachol is low, but bradycardia, sweating, bronchoconstriction and gastrointestinal effects are possible.
What this interaction means in plain words
Carbachol 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.
Carbachol belongs to Miscellaneous; Donepezil belongs to Central Nervous System.
Why it happens
Additive cholinergic stimulation from a direct agonist plus acetylcholinesterase inhibition.
What to do
Monitor heart rate and for cholinergic symptoms, especially with systemic carbachol. Use the lowest effective dose.
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
Other interactions of Carbachol
- Atropine + Carbachol Moderate
- Bethanechol + Carbachol Moderate
- Carbachol + Darifenacin Moderate
- Carbachol + Dicyclomine Moderate
- Carbachol + Flavoxate Moderate
- Carbachol + Galantamine Moderate
Frequently asked questions
Can I take Carbachol with Donepezil?
MediHelp rates the interaction as moderate. Carbachol 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. Carbachol is a direct cholinergic agonist and donepezil inhibits acetylcholinesterase, so cholinergic effects may be additive. Systemic exposure from ophthalmic carbachol is low, but bradycardia, sweating, bronchoconstriction and gastrointestinal effects are possible.
How serious is the interaction between Carbachol 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: Monitor heart rate and for cholinergic symptoms, especially with systemic carbachol. Use the lowest effective dose.
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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