Drug interactions
Donepezil + Flecainide
Severity: Moderate
Donepezil and Flecainide: 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
Donepezil can prolong the QT interval and cause bradycardia, and flecainide slows conduction and can be proarrhythmic. Combined use may raise the risk of torsades de pointes or conduction block.
What this interaction means in plain words
Donepezil and Flecainide 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; Flecainide belongs to Cardiovascular.
Why it happens
Additive effects on repolarization, with cholinesterase inhibition adding bradycardic effects.
What to do
Check a baseline ECG and heart rate and repeat after starting or adjusting either drug. Reassess the need for donepezil if the QT interval lengthens or symptomatic bradycardia occurs.
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 Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Other interactions of Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
Frequently asked questions
Can I take Donepezil with Flecainide?
MediHelp rates the interaction as moderate. Donepezil and Flecainide 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 can prolong the QT interval and cause bradycardia, and flecainide slows conduction and can be proarrhythmic. Combined use may raise the risk of torsades de pointes or conduction block.
How serious is the interaction between Donepezil and Flecainide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check a baseline ECG and heart rate and repeat after starting or adjusting either drug. Reassess the need for donepezil if the QT interval lengthens or symptomatic bradycardia occurs.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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