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Interações medicamentosas

Fosphenytoin + Lorlatinib

Gravidade: Contraindicada

Fosphenytoin and Lorlatinib: contraindicated interaction.

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Resumo

Fosphenytoin is converted to phenytoin, a strong CYP3A4 inducer. This lowers lorlatinib exposure substantially and risks loss of efficacy and hepatotoxicity.

O que esta interação significa em palavras simples

Fosphenytoin and Lorlatinib 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.

Fosphenytoin belongs to Central Nervous System; Lorlatinib belongs to Oncology.

Nível de evidência: Moderate

Por que acontece

Phenytoin induces CYP3A4 and increases lorlatinib metabolism.

O que fazer

Avoid the combination and change to a non-inducing anticonvulsant such as levetiracetam. Allow a washout period before starting lorlatinib.

O que perguntar ao farmacêutico

  • 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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Perguntas frequentes

Can I take Fosphenytoin with Lorlatinib?

MediHelp rates the interaction as contraindicated. Fosphenytoin and Lorlatinib 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. Fosphenytoin is converted to phenytoin, a strong CYP3A4 inducer. This lowers lorlatinib exposure substantially and risks loss of efficacy and hepatotoxicity.

How serious is the interaction between Fosphenytoin and Lorlatinib?

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 and change to a non-inducing anticonvulsant such as levetiracetam. Allow a washout period before starting lorlatinib.

What other medicines interact with Lorlatinib?

MediHelp also lists interactions of Lorlatinib with, for example, Amobarbital, Apalutamide, Butabarbital. The full list is on the Lorlatinib page.

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