Comparative dosages alprazolam, diazepam, lorazepam, oxazepam, temazepam, Ethanol withdrawal symptoms: Oral, I.V.: mg to start, dose may be. Jun 3, - Conversion tool to calculate benzodiazepine equivalents (convert 2 mg of IV midazolam, which is further supported using a midazolam oral. Apr 28, - Table 1. Benzodiazepine Equivalency Approximately Equivalent Oral Doses, mg Time to Peak Level, hours Half-life, hours Alprazolam (Xanax).