Drug interactions
Granisetron + Memantine-donepezil
Severity: Moderate
Granisetron 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
Granisetron can cause dose-related QT prolongation and donepezil has QT-prolonging potential, so combined use may increase arrhythmia risk. Donepezil-induced bradycardia may further add to the risk.
What this interaction means in plain words
Granisetron 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.
Granisetron belongs to Gastrointestinal Tract; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive QT prolongation.
What to do
Correct potassium and magnesium before use and monitor the ECG in patients with cardiac risk factors. Use the lowest effective granisetron dose.
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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Frequently asked questions
Can I take Granisetron with Memantine-donepezil?
MediHelp rates the interaction as moderate. Granisetron 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. Granisetron can cause dose-related QT prolongation and donepezil has QT-prolonging potential, so combined use may increase arrhythmia risk. Donepezil-induced bradycardia may further add to the risk.
How serious is the interaction between Granisetron 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: Correct potassium and magnesium before use and monitor the ECG in patients with cardiac risk factors. Use the lowest effective granisetron dose.
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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