Drug interactions
Memantine-donepezil + Sevoflurane
Severity: Moderate
Memantine-donepezil and Sevoflurane: 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
Sevoflurane can prolong the QT interval during anesthesia, and donepezil carries a known risk of QT prolongation and bradycardia. Together they may raise the risk of ventricular arrhythmias in the perioperative period. Donepezil may also prolong the effect of succinylcholine-type muscle relaxants.
What this interaction means in plain words
Memantine-donepezil and Sevoflurane 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.
Memantine-donepezil belongs to Central Nervous System; Sevoflurane belongs to Central Nervous System.
Why it happens
Additive QT prolongation and vagotonic effects from cholinesterase inhibition.
What to do
Inform the anesthesia team about donepezil use and monitor the ECG continuously during surgery. Keep electrolytes normal and have treatment for bradycardia available.
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 Sevoflurane
Frequently asked questions
Can I take Memantine-donepezil with Sevoflurane?
MediHelp rates the interaction as moderate. Memantine-donepezil and Sevoflurane 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. Sevoflurane can prolong the QT interval during anesthesia, and donepezil carries a known risk of QT prolongation and bradycardia. Together they may raise the risk of ventricular arrhythmias in the perioperative period. Donepezil may also prolong the effect of succinylcholine-type muscle relaxants.
How serious is the interaction between Memantine-donepezil and Sevoflurane?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Inform the anesthesia team about donepezil use and monitor the ECG continuously during surgery. Keep electrolytes normal and have treatment for bradycardia available.
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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