SPL Set ID: e1dab8ad-cbf6-4273-92fa-02629de2abde

Fosphenytoin sodium injection, USP is a prodrug intended for parenteral administration; its active metabolite is phenytoin. 1.5 mg of fosphenytoin sodium USP is equivalent to 1 mg phenytoin sodium, and is referred to as 1 mg phenytoin sodium equivalents (PE). The amount and concentration of fosphenytoin is always expressed in terms of mg PE. The pharmacological class of the fosphenytoin sodium is hydantoin derivative, and the therapeutic class is anticonvulsant. Fosphenytoin sodium injection, USP is marketed in 2 mL vials containing a total of 100 mg PE per 2 mL (50 mg PE per mL) and 10 mL vials containing a total of 500 mg PE per 10mL (50 mg PE per mL), for intravenous or intramuscular administration. The concentration of each vial is 50 mg PE per mL. Fosphenytoin sodium injection, USP is supplied in vials as a sterile solution in Water for Injection, USP, and Tromethamine, USP (TRIS) (12 mg per mL), buffer adjusted to pH 8.6 to 9.0 with either Hydrochloric Acid, NF, or Sodium Hydroxide, NF. Fosphenytoin sodium injection, USP is a clear, colorless to pale yellow, sterile solution. The chemical name of fosphenytoin is 5,5-diphenyl-3-[(phosphonooxy)methyl]-2,4-imidazolidinedione disodium salt. The molecular structure of fosphenytoin is: The molecular weight of fosphenytoin is 406.24. structural formula