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Interactions médicamenteuses

Gefitinib + Phenytoin

Gravité: Majeure

Gefitinib and Phenytoin: major interaction.

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Résumé

Phenytoin strongly induces CYP3A4 and can substantially lower gefitinib exposure. This may reduce antitumor efficacy in EGFR-mutated lung cancer.

Ce que signifie cette interaction, en termes simples

Gefitinib and Phenytoin 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.

Gefitinib belongs to Oncology; Phenytoin belongs to Central Nervous System.

Niveau de preuve: High

Pourquoi elle survient

CYP3A4 induction by phenytoin accelerates the metabolism of gefitinib.

Conduite à tenir

Prefer an alternative anticonvulsant without enzyme induction. If unavoidable, increase gefitinib to 500 mg daily and return to 250 mg about 7 days after phenytoin is stopped.

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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Questions fréquentes

Can I take Gefitinib with Phenytoin?

MediHelp rates the interaction as major. Gefitinib and Phenytoin 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. Phenytoin strongly induces CYP3A4 and can substantially lower gefitinib exposure. This may reduce antitumor efficacy in EGFR-mutated lung cancer.

How serious is the interaction between Gefitinib and Phenytoin?

MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an alternative anticonvulsant without enzyme induction. If unavoidable, increase gefitinib to 500 mg daily and return to 250 mg about 7 days after phenytoin is stopped.

What other medicines interact with Phenytoin?

MediHelp also lists interactions of Phenytoin with, for example, Artemether / lumefantrine, Bictegravir, Cabotegravir. The full list is on the Phenytoin 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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