Drug interactions
Loperamide + Memantine-donepezil
Severity: Moderate
Loperamide 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
Loperamide at usual doses is not a significant QT risk, but high doses can prolong the QT interval and cause arrhythmias. Combined with donepezil, which may also affect QT and heart rate, risk is higher with excessive loperamide use.
What this interaction means in plain words
Loperamide 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.
Loperamide belongs to Gastrointestinal Tract; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive QT prolongation, relevant mainly at supratherapeutic loperamide doses.
What to do
Keep loperamide at labeled doses and avoid prolonged or excessive use. Obtain an ECG if palpitations, syncope or high-dose use occurs.
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 Loperamide
Frequently asked questions
Can I take Loperamide with Memantine-donepezil?
MediHelp rates the interaction as moderate. Loperamide 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. Loperamide at usual doses is not a significant QT risk, but high doses can prolong the QT interval and cause arrhythmias. Combined with donepezil, which may also affect QT and heart rate, risk is higher with excessive loperamide use.
How serious is the interaction between Loperamide 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: Keep loperamide at labeled doses and avoid prolonged or excessive use. Obtain an ECG if palpitations, syncope or high-dose use occurs.
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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