Drug interactions
Memantine-donepezil + Propafenone
Severity: Major
Memantine-donepezil and Propafenone: major 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
Propafenone slows conduction and can prolong QRS and QT intervals with proarrhythmic potential. Donepezil adds bradycardia and possible QT prolongation, increasing arrhythmic risk.
What this interaction means in plain words
Memantine-donepezil and Propafenone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Memantine-donepezil belongs to Central Nervous System; Propafenone belongs to Cardiovascular.
Why it happens
Additive effects on cardiac conduction and repolarization, with cholinergic bradycardia from donepezil.
What to do
Avoid in patients with structural heart disease or conduction abnormalities. If both are used, monitor the ECG for QRS, PR and QTc changes and watch for bradycardia.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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 Propafenone
- Dofetilide + Propafenone Contraindicated
- Dronedarone + Propafenone Contraindicated
- Nilotinib + Propafenone Contraindicated
- Nirmatrelvir / ritonavir + Propafenone Contraindicated
- Nirmatrelvir + Propafenone Contraindicated
- Pimozide + Propafenone Contraindicated
Frequently asked questions
Can I take Memantine-donepezil with Propafenone?
MediHelp rates the interaction as major. Memantine-donepezil and Propafenone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Propafenone slows conduction and can prolong QRS and QT intervals with proarrhythmic potential. Donepezil adds bradycardia and possible QT prolongation, increasing arrhythmic risk.
How serious is the interaction between Memantine-donepezil and Propafenone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid in patients with structural heart disease or conduction abnormalities. If both are used, monitor the ECG for QRS, PR and QTc changes and watch for 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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