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Interactions médicamenteuses

Memantine-donepezil + Thioridazine

Gravité: Contre-indiquée

Memantine-donepezil and Thioridazine: contraindicated interaction.

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Résumé

Donepezil can prolong the QT interval and cause torsades de pointes, and thioridazine is a strongly QT-prolonging antipsychotic. Together the arrhythmia risk is increased. Donepezil-induced bradycardia adds to the risk.

Ce que signifie cette interaction, en termes simples

Memantine-donepezil and Thioridazine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.

Memantine-donepezil belongs to Central Nervous System; Thioridazine belongs to Central Nervous System.

Niveau de preuve: Moderate

Pourquoi elle survient

Additive QT prolongation, with cholinesterase-inhibitor bradycardia increasing torsades susceptibility.

Conduite à tenir

Avoid the combination; choose a non-QT-prolonging antipsychotic such as low-dose quetiapine if needed, with ECG monitoring.

Questions à poser à votre pharmacien

  • Is there an alternative to one of these two medicines for me?
  • If both are essential, who is monitoring me and how often?
  • Which symptoms mean I should stop and seek help straight away?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Questions fréquentes

Can I take Memantine-donepezil with Thioridazine?

MediHelp rates the interaction as contraindicated. Memantine-donepezil and Thioridazine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Donepezil can prolong the QT interval and cause torsades de pointes, and thioridazine is a strongly QT-prolonging antipsychotic. Together the arrhythmia risk is increased. Donepezil-induced bradycardia adds to the risk.

How serious is the interaction between Memantine-donepezil and Thioridazine?

MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination; choose a non-QT-prolonging antipsychotic such as low-dose quetiapine if needed, with ECG monitoring.

What other medicines interact with Memantine-donepezil?

MediHelp also lists interactions of Memantine-donepezil with, for example, Dronedarone, Amantadine, Amiodarone. The full list is on the Memantine-donepezil page.

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