Drug interactions
Memantine-donepezil + Quetiapine
Severity: Moderate
Memantine-donepezil and Quetiapine: moderate 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
Quetiapine can prolong the QT interval, particularly in overdose or when combined with other QT-prolonging drugs. Donepezil adds QT and bradycardia effects, which may raise arrhythmia risk in elderly dementia patients.
What this interaction means in plain words
Memantine-donepezil and Quetiapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Memantine-donepezil belongs to Central Nervous System; Quetiapine belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Use the lowest effective quetiapine dose and check the ECG in patients with cardiac risk factors. Keep potassium and magnesium normal and reassess the need for antipsychotic therapy regularly.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Memantine-donepezil with Quetiapine?
MediHelp rates the interaction as moderate. Memantine-donepezil and Quetiapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Quetiapine can prolong the QT interval, particularly in overdose or when combined with other QT-prolonging drugs. Donepezil adds QT and bradycardia effects, which may raise arrhythmia risk in elderly dementia patients.
How serious is the interaction between Memantine-donepezil and Quetiapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective quetiapine dose and check the ECG in patients with cardiac risk factors. Keep potassium and magnesium normal and reassess the need for antipsychotic therapy regularly.
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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