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You are seeing a 1yo child in status epilepticus (first time seizure). The child received 0.2 mg/kg intranasal midazolam in the field, 0.1 mg/kg IV lorazepam in the ED, then 20 mg/kg fosphenytoin, 60 mg/kg levetiracetam, and 40 mg/kg valproate, with no cessation of seizures. The bedside glucose and i-stat Na and Ca are normal. Which vitamin might you try next?