Drug interactions
Atropine + Donepezil
Severity: Moderate
Atropine 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
Atropine blocks muscarinic receptors and opposes the cholinergic effects of donepezil, which may reduce its efficacy. Conversely, donepezil can counteract atropine's effects, and the combination may be used deliberately to offset cholinergic side effects such as bradycardia or hypersalivation.
What this interaction means in plain words
Atropine 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.
Atropine belongs to Miscellaneous; Donepezil belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between a cholinesterase inhibitor and a muscarinic antagonist.
What to do
Monitor heart rate and cognitive and symptomatic response when used together. Avoid chronic systemic anticholinergics in patients taking donepezil for dementia.
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 Atropine
- Atropine + Eluxadoline Major
- Atropine + Henbane Major
- Atropine + Pramlintide Major
- Abobotulinumtoxina + Atropine Moderate
- Aclidinium + Atropine Moderate
- Amantadine + Atropine Moderate
Frequently asked questions
Can I take Atropine with Donepezil?
MediHelp rates the interaction as moderate. Atropine 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. Atropine blocks muscarinic receptors and opposes the cholinergic effects of donepezil, which may reduce its efficacy. Conversely, donepezil can counteract atropine's effects, and the combination may be used deliberately to offset cholinergic side effects such as bradycardia or hypersalivation.
How serious is the interaction between Atropine 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 cognitive and symptomatic response when used together. Avoid chronic systemic anticholinergics in patients taking donepezil for dementia.
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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