Drug interactions
Huperzine a + Memantine-donepezil
Severity: Moderate
Huperzine a and Memantine-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
Huperzine A is a reversible cholinesterase inhibitor, so combining it with donepezil duplicates therapy. This raises the risk of cholinergic toxicity such as nausea, vomiting, bradycardia, syncope and cramps.
What this interaction means in plain words
Huperzine a and Memantine-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.
Why it happens
Additive acetylcholinesterase inhibition.
What to do
Avoid combining; advise patients to stop huperzine A while on donepezil. If used together, monitor heart rate and GI tolerance.
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 Memantine-donepezil
- Dronedarone + Memantine-donepezil Contraindicated
- Memantine-donepezil + Thioridazine Contraindicated
- Amantadine + Memantine-donepezil Major
- Amiodarone + Memantine-donepezil Major
- Amisulpride + Memantine-donepezil Major
- Amitriptyline + Memantine-donepezil Major
Frequently asked questions
Can I take Huperzine a with Memantine-donepezil?
MediHelp rates the interaction as moderate. Huperzine a and Memantine-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. Huperzine A is a reversible cholinesterase inhibitor, so combining it with donepezil duplicates therapy. This raises the risk of cholinergic toxicity such as nausea, vomiting, bradycardia, syncope and cramps.
How serious is the interaction between Huperzine a and Memantine-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: Avoid combining; advise patients to stop huperzine A while on donepezil. If used together, monitor heart rate and GI tolerance.
What other medicines interact with Memantine-donepezil?
MediHelp also lists interactions of Memantine-donepezil with, for example, Dronedarone, Thioridazine, Amantadine. The full list is on the Memantine-donepezil page.
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