Drug interactions
Flecainide + Memantine-donepezil
Severity: Major
Flecainide and Memantine-donepezil: 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
Flecainide slows cardiac conduction and can prolong QRS and QT intervals with a proarrhythmic risk. Donepezil may add QT prolongation and bradycardia, increasing the risk of conduction disturbances and arrhythmia.
What this interaction means in plain words
Flecainide and Memantine-donepezil 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.
Flecainide belongs to Cardiovascular; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive effects on cardiac conduction and repolarization, with donepezil adding vagotonic bradycardia.
What to do
Avoid if possible, especially in patients with structural heart disease or conduction abnormalities. If both are used, monitor the ECG for PR, QRS 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 Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Frequently asked questions
Can I take Flecainide with Memantine-donepezil?
MediHelp rates the interaction as major. Flecainide and Memantine-donepezil 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. Flecainide slows cardiac conduction and can prolong QRS and QT intervals with a proarrhythmic risk. Donepezil may add QT prolongation and bradycardia, increasing the risk of conduction disturbances and arrhythmia.
How serious is the interaction between Flecainide and Memantine-donepezil?
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 if possible, especially in patients with structural heart disease or conduction abnormalities. If both are used, monitor the ECG for PR, QRS 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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