enzodiazepines1 Half-life (hrs)2 [active metabolite] Approximately Equivalent Oral dosages (mg)3 Market Aim4 Alprazolam (Xanax, Xanor, Tafil) 6-12 0.5 a Bromazepam (Lexotan, Lexomil) 10-20 5-6 a Chlordiazepoxide (Librium) 5-30 [36-200] 25 a Clobazam (Frisium)5 12-60 20 a,e Clonazepam (Klonopin, Rivotril)5 18-50 0.5 a,e Clorazepate (Tranxene) [36-200] 15 a Diazepam (Valium) 20-100 [36-200] 10 a E..