Which of the following is NOT listed as a second-line agent for status epilepticus?

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In status epilepticus, treatment is typically stepped: start with a benzodiazepine given IV to stop the seizure quickly, then, if seizures persist, move to second-line IV antiseizure medications. The drugs commonly used as second-line are levetiracetam, fosphenytoin (or phenytoin), and valproic acid because they provide longer-acting control and have favorable safety profiles for ongoing management. Diazepam is a benzodiazepine and is primarily used as the initial, rapid-acting therapy. It has a relatively short duration of action due to rapid redistribution into fat and muscle, which makes it less ideal for ongoing seizure control compared with the other second-line options. Therefore, diazepam is not listed as a second-line agent. The other three drugs—levetiracetam, fosphenytoin, and valproic acid—fit the second-line role by providing sustained antiseizure effects after the first-line benzodiazepine.