Drug interactions
Amoxapine + Donepezil
Severity: Major
Amoxapine and 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
Donepezil has a known risk of QT prolongation and torsades de pointes, and amoxapine, a tricyclic-related antidepressant, can also prolong the QT interval. Combined use may raise arrhythmia risk, especially with electrolyte disturbance or cardiac disease. Amoxapine's anticholinergic activity may also oppose donepezil's cholinergic benefit.
What this interaction means in plain words
Amoxapine and 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 QT prolongation, plus pharmacodynamic opposition of cholinesterase inhibition by antimuscarinic effects.
What to do
Avoid the combination where possible; if used, obtain a baseline ECG, correct potassium and magnesium, and monitor the QTc. Consider an antidepressant with less QT and anticholinergic liability.
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 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 Amoxapine with Donepezil?
MediHelp rates the interaction as major. Amoxapine and 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. Donepezil has a known risk of QT prolongation and torsades de pointes, and amoxapine, a tricyclic-related antidepressant, can also prolong the QT interval. Combined use may raise arrhythmia risk, especially with electrolyte disturbance or cardiac disease. Amoxapine's anticholinergic activity may also oppose donepezil's cholinergic benefit.
How serious is the interaction between Amoxapine and 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; if used, obtain a baseline ECG, correct potassium and magnesium, and monitor the QTc. Consider an antidepressant with less QT and anticholinergic liability.
What other medicines interact with Donepezil?
MediHelp also lists interactions of Donepezil with, for example, Dronedarone, Pimozide, Thioridazine. The full list is on the Donepezil page.
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