Drug interactions
Echothiophate iodide + Memantine-donepezil
Severity: Moderate
Echothiophate iodide 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
Echothiophate is an irreversible cholinesterase inhibitor and donepezil is a reversible one, so combining them stacks cholinergic stimulation. This can cause bradycardia, bronchospasm, excess secretions, gastrointestinal cramping and muscle weakness. Systemic absorption of ophthalmic echothiophate is limited but not zero.
What this interaction means in plain words
Echothiophate iodide 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 produces summed cholinergic (muscarinic and nicotinic) effects.
What to do
Monitor heart rate and for GI, respiratory and neuromuscular cholinergic signs when both are used. Reduce or stop one agent if symptoms of cholinergic excess appear.
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 Echothiophate iodide with Memantine-donepezil?
MediHelp rates the interaction as moderate. Echothiophate iodide 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. Echothiophate is an irreversible cholinesterase inhibitor and donepezil is a reversible one, so combining them stacks cholinergic stimulation. This can cause bradycardia, bronchospasm, excess secretions, gastrointestinal cramping and muscle weakness. Systemic absorption of ophthalmic echothiophate is limited but not zero.
How serious is the interaction between Echothiophate iodide 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 GI, respiratory and neuromuscular cholinergic signs when both are used. Reduce or stop one agent if symptoms of cholinergic excess appear.
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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