Drug interactions
Lithium + Memantine-donepezil
Severity: Moderate
Lithium and Memantine-donepezil: 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
Lithium can cause QT prolongation, sinus node dysfunction and bradycardia, particularly at elevated levels. Donepezil may add to bradycardia and QT effects, which increases the risk of syncope and arrhythmia.
What this interaction means in plain words
Lithium and Memantine-donepezil 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.
Lithium belongs to Central Nervous System; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive effects on cardiac repolarization and sinus node function, with cholinergic bradycardia from donepezil.
What to do
Monitor heart rate, ECG and serum lithium levels, particularly in older patients and those with cardiac disease. Keep lithium levels in the therapeutic range and correct electrolytes.
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 Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Frequently asked questions
Can I take Lithium with Memantine-donepezil?
MediHelp rates the interaction as moderate. Lithium and Memantine-donepezil 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. Lithium can cause QT prolongation, sinus node dysfunction and bradycardia, particularly at elevated levels. Donepezil may add to bradycardia and QT effects, which increases the risk of syncope and arrhythmia.
How serious is the interaction between Lithium and Memantine-donepezil?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor heart rate, ECG and serum lithium levels, particularly in older patients and those with cardiac disease. Keep lithium levels in the therapeutic range and correct electrolytes.
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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