Drug interactions
Cyproheptadine + Donepezil transdermal
Severity: Moderate
Cyproheptadine and Donepezil transdermal: 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 cholinergic activity while cyproheptadine has anticholinergic activity, so the two may oppose each other. The anticholinergic effect of cyproheptadine can reduce the cognitive benefit of donepezil.
What this interaction means in plain words
Cyproheptadine and Donepezil transdermal 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 between acetylcholinesterase inhibition and muscarinic receptor blockade.
What to do
Avoid cyproheptadine in patients with dementia treated with donepezil where possible, and choose a non-anticholinergic antihistamine. If both are used, monitor cognition and function.
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 Cyproheptadine
- Cyproheptadine + Isocarboxazid Contraindicated
- Cyproheptadine + Phenelzine Contraindicated
- Cyproheptadine + Tranylcypromine Contraindicated
- Alfentanil + Cyproheptadine Major
- Belladonna and opium + Cyproheptadine Major
- Benzhydrocodone / acetaminophen + Cyproheptadine Major
Frequently asked questions
Can I take Cyproheptadine with Donepezil transdermal?
MediHelp rates the interaction as moderate. Cyproheptadine and Donepezil transdermal 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 cholinergic activity while cyproheptadine has anticholinergic activity, so the two may oppose each other. The anticholinergic effect of cyproheptadine can reduce the cognitive benefit of donepezil.
How serious is the interaction between Cyproheptadine and Donepezil transdermal?
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 cyproheptadine in patients with dementia treated with donepezil where possible, and choose a non-anticholinergic antihistamine. If both are used, monitor cognition and function.
What other medicines interact with Cyproheptadine?
MediHelp also lists interactions of Cyproheptadine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Cyproheptadine page.
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