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Interactions médicamenteuses

Ketoconazole + Tolvaptan

Gravité: Contre-indiquée

Ketoconazole and Tolvaptan: contraindicated interaction.

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Résumé

Ketoconazole greatly increases tolvaptan exposure. This can cause excessively rapid aquaresis, dehydration, hypernatremia and osmotic demyelination risk from overly fast sodium correction.

Ce que signifie cette interaction, en termes simples

Ketoconazole and Tolvaptan 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.

Ketoconazole belongs to Anti Fungals; Tolvaptan belongs to Endocrine.

Niveau de preuve: High

Pourquoi elle survient

Strong CYP3A4 inhibition markedly decreases tolvaptan metabolism.

Conduite à tenir

Avoid the combination; strong CYP3A4 inhibitors are contraindicated with tolvaptan. Use an alternative antifungal, or hold tolvaptan during treatment.

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 Ketoconazole with Tolvaptan?

MediHelp rates the interaction as contraindicated. Ketoconazole and Tolvaptan 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. Ketoconazole greatly increases tolvaptan exposure. This can cause excessively rapid aquaresis, dehydration, hypernatremia and osmotic demyelination risk from overly fast sodium correction.

How serious is the interaction between Ketoconazole and Tolvaptan?

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; strong CYP3A4 inhibitors are contraindicated with tolvaptan. Use an alternative antifungal, or hold tolvaptan during treatment.

What other medicines interact with Ketoconazole?

MediHelp also lists interactions of Ketoconazole with, for example, Alfuzosin, Alprazolam, Avanafil. The full list is on the Ketoconazole page.

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