Apr 28, - Table 1. Benzodiazepine Equivalency Approximately Equivalent Oral Doses, mg Time to Peak Level, hours Half-life, hours Alprazolam (Xanax) 0. 15– Lorazepam (Ativan). 1–2. Nitrazepam (Mogadon)*. Jun 3, - Alprazolam (Xanax), Chlordiazepoxide (Librium), Clonazepam (Klonopin) All benzodiazepine conversions used in this calculator are based on published come from an alcohol withdrawal setting using oral dosage forms. on chronic administration of continuous intravenous lorazepam or midazolam. Alprazolam1 (Xanax®), Int. , , -, mg. Clonazepam1 (Rivotril®), Int. , , -, mg. Lorazepam1 (Ativan®). Int. (po), Rapid (sl, IV). (po).