Drug interactions
Fexinidazole + Memantine-donepezil
Severity: Major
Fexinidazole 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
Fexinidazole carries a labeled warning for QT prolongation and donepezil can also prolong the QT interval. Using both increases the risk of torsades de pointes, especially in older patients or those with electrolyte disturbances.
What this interaction means in plain words
Fexinidazole 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.
Why it happens
Additive prolongation of cardiac repolarization via potassium channel effects.
What to do
Avoid the combination where possible; consider holding donepezil during the fexinidazole course if clinically acceptable. If both are needed, obtain an ECG and correct potassium and magnesium before and during treatment.
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
Frequently asked questions
Can I take Fexinidazole with Memantine-donepezil?
MediHelp rates the interaction as major. Fexinidazole 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. Fexinidazole carries a labeled warning for QT prolongation and donepezil can also prolong the QT interval. Using both increases the risk of torsades de pointes, especially in older patients or those with electrolyte disturbances.
How serious is the interaction between Fexinidazole 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 the combination where possible; consider holding donepezil during the fexinidazole course if clinically acceptable. If both are needed, obtain an ECG and correct potassium and magnesium before and during treatment.
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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