Drug interactions
Hydroxychloroquine + Memantine-donepezil
Severity: Major
Hydroxychloroquine 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
Hydroxychloroquine can prolong the QT interval and has been linked to ventricular arrhythmias. Combined with donepezil, which also affects QT and heart rate, the arrhythmia risk may increase.
What this interaction means in plain words
Hydroxychloroquine 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.
Hydroxychloroquine belongs to Musculoskeletal; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Obtain a baseline ECG and correct electrolyte abnormalities before starting. Monitor the QTc periodically and reconsider the combination if it exceeds safe limits or the patient has syncope or palpitations.
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 Hydroxychloroquine
- Arsenic trioxide + Hydroxychloroquine Contraindicated
- Cisapride + Hydroxychloroquine Contraindicated
- Dronedarone + Hydroxychloroquine Contraindicated
- Hydroxychloroquine + Pimozide Contraindicated
- Hydroxychloroquine + Thioridazine Contraindicated
- Hydroxychloroquine + Vandetanib Contraindicated
Frequently asked questions
Can I take Hydroxychloroquine with Memantine-donepezil?
MediHelp rates the interaction as major. Hydroxychloroquine 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. Hydroxychloroquine can prolong the QT interval and has been linked to ventricular arrhythmias. Combined with donepezil, which also affects QT and heart rate, the arrhythmia risk may increase.
How serious is the interaction between Hydroxychloroquine 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: Obtain a baseline ECG and correct electrolyte abnormalities before starting. Monitor the QTc periodically and reconsider the combination if it exceeds safe limits or the patient has syncope or palpitations.
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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