High Quality Content by WIKIPEDIA articles! Prazepam is a benzodiazepine derivative drug developed by Warner-Lambert in the 1960s. It possesses anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. Prazepam is a prodrug for desmethyldiazepam which is an active metabolite of prazepam. Desmethyldiazepam is responsible for the therapeutic effects of prazepam.