Interações medicamentosas
Fosphenytoin + Sodium valproate
Gravidade: Grave
Fosphenytoin and Sodium valproate: major interaction.
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Resumo
Valproate displaces phenytoin from protein binding and inhibits its metabolism, changing free phenytoin levels. The combination has also been linked to hyperammonemia and encephalopathy.
O que esta interação significa em palavras simples
Fosphenytoin and Sodium valproate 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.
Fosphenytoin belongs to Central Nervous System; Sodium valproate belongs to Central Nervous System.
Por que acontece
Protein-binding displacement and metabolic inhibition alter phenytoin exposure, and valproate impairs ammonia detoxification.
O que fazer
Monitor free phenytoin concentrations and ammonia if there is lethargy or confusion, adjusting doses as needed.
O que perguntar ao farmacêutico
- 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?
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Outras interações de Fosphenytoin
- Dronedarone + Fosphenytoin Contraindicada
- Fosphenytoin + Ledipasvir-sofosbuvir Contraindicada
- Fosphenytoin + Lorlatinib Contraindicada
- Fosphenytoin + Lurasidone Contraindicada
- Fosphenytoin + Ranolazine Contraindicada
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Contraindicada
Outras interações de Sodium valproate
Perguntas frequentes
Can I take Fosphenytoin with Sodium valproate?
MediHelp rates the interaction as major. Fosphenytoin and Sodium valproate 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. Valproate displaces phenytoin from protein binding and inhibits its metabolism, changing free phenytoin levels. The combination has also been linked to hyperammonemia and encephalopathy.
How serious is the interaction between Fosphenytoin and Sodium valproate?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor free phenytoin concentrations and ammonia if there is lethargy or confusion, adjusting doses as needed.
What other medicines interact with Fosphenytoin?
MediHelp also lists interactions of Fosphenytoin with, for example, Dronedarone, Ledipasvir-sofosbuvir, Lorlatinib. The full list is on the Fosphenytoin page.
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