Boxed Warning (Boxed Warning)
The administration of intravenous Phenytoin Sodium Injection should not exceed certain rates to avoid cardiovascular risk. The recommended rates are 50 mg per minute in adults and 1-3 mg/kg/min (or 50 mg per minute, whichever is slower) in pediatric patients. Careful cardiac monitoring is required during and after the administration of this drug. Even at or below the recommended infusion rate, there is a risk of severe hypotension and cardiac arrhythmias. Dosage may need to be reduced or discontinued if necessary. See Dosage and Administration (2.1) and Warnings and Precautions (5.1) for more information.*