Drug interactions
Donepezil + Scopolamine
Severity: Moderate
Donepezil and Scopolamine: 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 by inhibiting cholinesterase, whereas scopolamine blocks muscarinic receptors. The two have opposing actions, so scopolamine may reduce the cognitive benefit of donepezil and donepezil may offset scopolamine's effects.
What this interaction means in plain words
Donepezil and Scopolamine 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; Scopolamine belongs to Respiratory.
Why it happens
Pharmacodynamic antagonism between cholinesterase inhibition and muscarinic receptor blockade.
What to do
Avoid anticholinergics such as scopolamine in patients taking donepezil when alternatives exist. If needed, monitor cognition and treatment response.
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 Scopolamine
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 Scopolamine?
MediHelp rates the interaction as moderate. Donepezil and Scopolamine 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 by inhibiting cholinesterase, whereas scopolamine blocks muscarinic receptors. The two have opposing actions, so scopolamine may reduce the cognitive benefit of donepezil and donepezil may offset scopolamine's effects.
How serious is the interaction between Donepezil and Scopolamine?
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 anticholinergics such as scopolamine in patients taking donepezil when alternatives exist. If needed, monitor cognition and treatment response.
What other medicines interact with Scopolamine?
MediHelp also lists interactions of Scopolamine with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Scopolamine page.
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