| Benzodiazepine | Onset of Action | Duration |
|---|---|---|
| Alprazolam (Xanax) | 30 min | 6-20 h |
| Lorazepam (Ativan) | 30-60 min | 10-20 h |
| Bromazepam (Lexotan) | 30 min - 4 h | 10-20 h |
| Chlordiazepoxide (Librium) | 1.5 h | 5-30 h |
| Clonazepam (Rivotril) | 1 h | 18-39 h |
| Clorazepate (Tranxene) | 1 h | 36-200 h |
| Diazepam (Valium) | 30 min | 20-50 h |
| Flurazepam (Dalmane) | 1 h | 12-100 h |
| Midazolam IV (Versed) | 1-3 min | 2-4 h |
| Midazolam PO | 10-20 min | 20 min - 3 h |
| Oxazepam (Serax) | 3 h | 3-21 h |
| Quazepam (Doral) | 20-45 min | 25-100 h |
| Temazepam (Restoril) | 30-60 min | 10-20 h |
| Triazolam (Halcion) | 30 min | 1.6-5.5 h |