Drug interactions
Carbachol + Memantine-donepezil
Severity: Moderate
Carbachol 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
Carbachol is a direct cholinergic agonist and donepezil raises acetylcholine levels, so their effects may be additive. Systemic exposure with ophthalmic carbachol is low, but cholinergic effects such as bradycardia, bronchospasm and GI upset are possible.
What this interaction means in plain words
Carbachol 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.
Carbachol belongs to Miscellaneous; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive cholinergic stimulation from a muscarinic agonist and a cholinesterase inhibitor.
What to do
Monitor heart rate and for cholinergic symptoms, especially in patients with asthma, COPD or bradycardia.
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 Carbachol
- Atropine + Carbachol Moderate
- Bethanechol + Carbachol Moderate
- Carbachol + Darifenacin Moderate
- Carbachol + Dicyclomine Moderate
- Carbachol + Donepezil Moderate
- Carbachol + Flavoxate Moderate
Frequently asked questions
Can I take Carbachol with Memantine-donepezil?
MediHelp rates the interaction as moderate. Carbachol 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. Carbachol is a direct cholinergic agonist and donepezil raises acetylcholine levels, so their effects may be additive. Systemic exposure with ophthalmic carbachol is low, but cholinergic effects such as bradycardia, bronchospasm and GI upset are possible.
How serious is the interaction between Carbachol 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: Monitor heart rate and for cholinergic symptoms, especially in patients with asthma, COPD or bradycardia.
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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