Which one of the following is not a useful drug for the initial management of a case with status epilepticus?

At present, early recognition of the condition and treatment with oral or rectal benzodiazepines is recommended; oral clobazam has proven to be an effective treatment. In patients who have repetitive attacks of complex paial status epilepticus, oral or iv clobazam (1020 mg/day) over a period of 23 days given early at home can usually abo the status epilepticus Ref Harrison20th edition pg 2567