Drug interactions
Chloroquine + Memantine-donepezil
Severity: Major
Chloroquine 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
Chloroquine is a known QT-prolonging drug that can precipitate torsades de pointes. Donepezil also has a risk of QT prolongation and bradycardia, so combined use may amplify arrhythmia risk.
What this interaction means in plain words
Chloroquine 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.
Chloroquine belongs to Anti Parasitic; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT interval prolongation through cardiac repolarization effects.
What to do
Avoid the combination where an alternative antimalarial or anti-inflammatory is available. If it is unavoidable, check a baseline ECG and electrolytes and monitor the QTc 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
Other interactions of Chloroquine
- Chloroquine + Cisapride Contraindicated
- Chloroquine + Dofetilide Contraindicated
- Chloroquine + Dronedarone Contraindicated
- Chloroquine + Droperidol Contraindicated
- Chloroquine + Panobinostat Contraindicated
- Chloroquine + Pimozide Contraindicated
Frequently asked questions
Can I take Chloroquine with Memantine-donepezil?
MediHelp rates the interaction as major. Chloroquine 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. Chloroquine is a known QT-prolonging drug that can precipitate torsades de pointes. Donepezil also has a risk of QT prolongation and bradycardia, so combined use may amplify arrhythmia risk.
How serious is the interaction between Chloroquine 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 an alternative antimalarial or anti-inflammatory is available. If it is unavoidable, check a baseline ECG and electrolytes and monitor the QTc 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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