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Interazioni tra farmaci

Fosphenytoin + Lurasidone

Gravità: Controindicata

Fosphenytoin and Lurasidone: contraindicated interaction.

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Sintesi

Fosphenytoin is converted to phenytoin, a strong CYP3A4 inducer that can reduce lurasidone exposure dramatically. This may lead to loss of antipsychotic efficacy and relapse. Strong inducers are contraindicated with lurasidone.

Cosa significa questa interazione in parole semplici

Fosphenytoin and Lurasidone 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; Lurasidone belongs to Central Nervous System.

Livello di evidenza: High

Perché avviene

Induction of CYP3A4 by phenytoin increases lurasidone clearance.

Cosa fare

Avoid the combination; use an alternative anticonvulsant or an antipsychotic not dependent on CYP3A4, and monitor psychiatric status.

Cosa chiedere al farmacista

  • 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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Domande frequenti

Can I take Fosphenytoin with Lurasidone?

MediHelp rates the interaction as contraindicated. Fosphenytoin and Lurasidone 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 that can reduce lurasidone exposure dramatically. This may lead to loss of antipsychotic efficacy and relapse. Strong inducers are contraindicated with lurasidone.

How serious is the interaction between Fosphenytoin and Lurasidone?

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; use an alternative anticonvulsant or an antipsychotic not dependent on CYP3A4, and monitor psychiatric status.

What other medicines interact with Lurasidone?

MediHelp also lists interactions of Lurasidone with, for example, Apalutamide, Atazanavir, Carbamazepine. The full list is on the Lurasidone page.

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