Drug interactions
Donepezil + Pyridostigmine
Severity: Moderate
Donepezil and Pyridostigmine: 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
Both drugs inhibit cholinesterase, so their cholinergic effects add together. This can cause bradycardia, abdominal cramps, increased secretions and, at high exposure, cholinergic crisis with muscle weakness.
What this interaction means in plain words
Donepezil and Pyridostigmine 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 belongs to Central Nervous System; Pyridostigmine belongs to Central Nervous System.
Why it happens
Additive acetylcholinesterase inhibition.
What to do
Avoid combining unless clearly needed. If used, monitor heart rate, muscarinic symptoms and muscle strength and adjust doses.
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 Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
Other interactions of Pyridostigmine
Frequently asked questions
Can I take Donepezil with Pyridostigmine?
MediHelp rates the interaction as moderate. Donepezil and Pyridostigmine 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. Both drugs inhibit cholinesterase, so their cholinergic effects add together. This can cause bradycardia, abdominal cramps, increased secretions and, at high exposure, cholinergic crisis with muscle weakness.
How serious is the interaction between Donepezil and Pyridostigmine?
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 unless clearly needed. If used, monitor heart rate, muscarinic symptoms and muscle strength and adjust doses.
What other medicines interact with Donepezil?
MediHelp also lists interactions of Donepezil with, for example, Dronedarone, Pimozide, Thioridazine. The full list is on the Donepezil page.
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