sulfisoxazole and Fosphenytoin Interactions

Interactions between sulfisoxazole(sulfiSOXAZOLE) and Fosphenytoin (fosphenytoin)

sulfiSOXAZOLE and fosphenytoin (Moderate Drug-Drug)

MONITOR: Some sulfonamides may inhibit the hepatic metabolism of hydantoins. Serum hydantoin levels and risk of toxicity may be increased. Data are available for sulfadiazine, sulfaphenazole, and sulfamethizole.

MANAGEMENT: Monitoring for clinical and laboratory evidence of altered efficacy and safety is recommended. Hydantoin dosage adjustments or an alternate antimicrobial may be required if an interaction is suspected. Patients should be advised to notify their physician if they experience symptoms of hydantoin toxicity (e.g., drowsiness, visual disturbances, change in mental status, seizures, nausea, or ataxia).