Drug interactions
Iloperidone + Memantine-donepezil
Severity: Major
Iloperidone 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
Iloperidone prolongs the QT interval and donepezil can also do so. Together they increase the risk of torsades de pointes, particularly in older patients with cardiac disease.
What this interaction means in plain words
Iloperidone 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.
Iloperidone belongs to Central Nervous System; Memantine-donepezil belongs to Central Nervous System.
Why it happens
Additive QT prolongation.
What to do
Avoid the combination if possible by choosing an antipsychotic with less QT effect. If needed, check baseline ECG, correct electrolytes and monitor QTc.
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 Iloperidone
- Iloperidone + Thioridazine Contraindicated
- Alfuzosin + Iloperidone Major
- Amiodarone + Iloperidone Major
- Amisulpride + Iloperidone Major
- Amitriptyline + Iloperidone Major
- Anagrelide + Iloperidone Major
Frequently asked questions
Can I take Iloperidone with Memantine-donepezil?
MediHelp rates the interaction as major. Iloperidone 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. Iloperidone prolongs the QT interval and donepezil can also do so. Together they increase the risk of torsades de pointes, particularly in older patients with cardiac disease.
How serious is the interaction between Iloperidone 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: Avoid the combination if possible by choosing an antipsychotic with less QT effect. If needed, check baseline ECG, correct electrolytes and monitor QTc.
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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