Drug interactions
Hyoscyamine + Memantine-donepezil
Severity: Moderate
Hyoscyamine 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
Hyoscyamine is an antimuscarinic and pharmacologically opposes donepezil. In patients with dementia, it can worsen cognition and confusion and reduce the benefit of treatment.
What this interaction means in plain words
Hyoscyamine 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.
Hyoscyamine belongs to Genitourinary; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between a muscarinic antagonist and a cholinesterase inhibitor.
What to do
Avoid if possible and use a non-anticholinergic alternative. If necessary, use the lowest dose and monitor cognition and behavior.
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
Other interactions of Hyoscyamine
- Amantadine + Hyoscyamine Moderate
- Amitriptyline + Hyoscyamine Moderate
- Aripiprazole + Hyoscyamine Moderate
- Atropine + Hyoscyamine Moderate
- Benztropine + Hyoscyamine Moderate
- Bethanechol + Hyoscyamine Moderate
Frequently asked questions
Can I take Hyoscyamine with Memantine-donepezil?
MediHelp rates the interaction as moderate. Hyoscyamine 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. Hyoscyamine is an antimuscarinic and pharmacologically opposes donepezil. In patients with dementia, it can worsen cognition and confusion and reduce the benefit of treatment.
How serious is the interaction between Hyoscyamine 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 if possible and use a non-anticholinergic alternative. If necessary, use the lowest dose and monitor cognition and behavior.
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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