Time-Dependent Decline in Serum Phenytoin Concentration With Heightened Convulsive Seizure Risk by Prolonged Administration of Fosphenytoin in Japanese

Background:Because clinical data to confirm the safety and effectiveness of fosphenytoin, a prodrug of phenytoin, are insufficient, the length of administration of fosphenytoin is restricted. Nevertheless, some cases require fosphenytoin administration for more than a few days. The aim of this study