After benzodiazepine administration, which dosing is commonly used for second-line anticonvulsants in status epilepticus?

• A. Phenytoin or fosphenytoin 20 mg PE/kg IV (max ~1500 mg); Valproate 40 mg/kg IV up to 3 g; Levetiracetam 60 mg/kg IV up to 4.5 g.
• B. Phenytoin 5 mg/kg IV; Valproate 10 mg/kg IV; Levetiracetam 10 mg/kg IV.
• C. Phenytoin 100 mg IV; Valproate 1 g IV; Levetiracetam 200 mg IV.
• D. Phenytoin 30 mg/kg PO; Valproate 50 mg/kg PO; Levetiracetam 25 mg/kg PO.

Answer: (A)

After benzodiazepines, you boost seizure control with an IV loading dose of a second-line anticonvulsant to rapidly achieve therapeutic levels. The most commonly used regimens for this purpose are phenytoin or fosphenytoin at 20 mg phenytoin equivalents per kilogram IV (maximum about 1500 mg), valproate at 40 mg/kg IV up to 3 g, and levetiracetam at 60 mg/kg IV up to 4.5 g. This approach provides effective, rapid control while you assess and manage ongoing status epilepticus. The other dosing schemes shown are not appropriate for acute management: they use too low, non-weight-based, or oral doses, which won’t reliably control seizures in the emergency setting.