Drug interactions
Donepezil + Homatropine
Severity: Moderate
Donepezil and Homatropine: 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
Homatropine is an antimuscarinic and opposes donepezil's cholinergic action. Systemic use, such as in combination cough products, may reduce donepezil benefit and worsen confusion, while ophthalmic use has little systemic effect.
What this interaction means in plain words
Donepezil and Homatropine 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; Homatropine belongs to Genitourinary.
Why it happens
Muscarinic antagonism opposing cholinesterase inhibition.
What to do
Avoid systemic homatropine products in dementia where an alternative exists. Monitor cognition and heart rate if coadministration is necessary.
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 Homatropine
- Amantadine + Homatropine Moderate
- Amitriptyline + Homatropine Moderate
- Atropine + Homatropine Moderate
- Benztropine + Homatropine Moderate
- Bethanechol + Homatropine Moderate
- Chlorpromazine + Homatropine Moderate
Frequently asked questions
Can I take Donepezil with Homatropine?
MediHelp rates the interaction as moderate. Donepezil and Homatropine 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. Homatropine is an antimuscarinic and opposes donepezil's cholinergic action. Systemic use, such as in combination cough products, may reduce donepezil benefit and worsen confusion, while ophthalmic use has little systemic effect.
How serious is the interaction between Donepezil and Homatropine?
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 systemic homatropine products in dementia where an alternative exists. Monitor cognition and heart rate if coadministration is necessary.
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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