Drug interactions
Citalopram + Memantine-donepezil
Severity: Major
Citalopram 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
Citalopram causes dose-dependent QT prolongation, and donepezil can also prolong the QT interval and slow the heart rate. Used together they may increase the risk of torsades de pointes, particularly in older adults.
What this interaction means in plain words
Citalopram 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.
Citalopram belongs to Central Nervous System; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation, with donepezil adding bradycardia.
What to do
Keep citalopram at or below the age-adjusted maximum dose, or choose an antidepressant with less QT effect such as sertraline. Check the ECG and electrolytes at baseline and after dose changes.
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 Citalopram
- Cisapride + Citalopram Contraindicated
- Citalopram + Dronedarone Contraindicated
- Citalopram + Escitalopram Contraindicated
- Citalopram + Isocarboxazid Contraindicated
- Citalopram + Methylene blue Contraindicated
- Citalopram + Phenelzine Contraindicated
Frequently asked questions
Can I take Citalopram with Memantine-donepezil?
MediHelp rates the interaction as major. Citalopram 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. Citalopram causes dose-dependent QT prolongation, and donepezil can also prolong the QT interval and slow the heart rate. Used together they may increase the risk of torsades de pointes, particularly in older adults.
How serious is the interaction between Citalopram 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: Keep citalopram at or below the age-adjusted maximum dose, or choose an antidepressant with less QT effect such as sertraline. Check the ECG and electrolytes at baseline and after dose changes.
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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