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Interactions médicamenteuses

Dofetilide + Mexiletine

Gravité: Majeure

Dofetilide and Mexiletine: major interaction.

Dernière mise à jour Sources: UK SmPC

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Résumé

Dofetilide prolongs repolarization and can cause torsades de pointes. Mexiletine shortens the action potential and has less QT effect, but both are antiarrhythmics with proarrhythmic potential. Combined use is not well studied.

Ce que signifie cette interaction, en termes simples

Dofetilide and Mexiletine 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.

Dofetilide belongs to Cardiovascular; Mexiletine belongs to Cardiovascular.

Niveau de preuve: Low

Pourquoi elle survient

Additive antiarrhythmic and proarrhythmic electrophysiologic effects.

Conduite à tenir

Avoid unless specialist-directed; if used, monitor ECG, QTc and electrolytes, especially during dofetilide initiation in hospital.

Questions à poser à votre pharmacien

  • 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?

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

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Références

Questions fréquentes

Can I take Dofetilide with Mexiletine?

MediHelp rates the interaction as major. Dofetilide and Mexiletine 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. Dofetilide prolongs repolarization and can cause torsades de pointes. Mexiletine shortens the action potential and has less QT effect, but both are antiarrhythmics with proarrhythmic potential. Combined use is not well studied.

How serious is the interaction between Dofetilide and Mexiletine?

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 unless specialist-directed; if used, monitor ECG, QTc and electrolytes, especially during dofetilide initiation in hospital.

What other medicines interact with Mexiletine?

MediHelp also lists interactions of Mexiletine with, for example, Fezolinetant, Pimozide, Alosetron. The full list is on the Mexiletine page.

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Ouvrez le référentiel complet, vérifiez les interactions entre plusieurs médicaments et utilisez les outils de posologie dans l'application MediHelp.

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