Phenazepam Drugbuy phenazepam online Description DescriptionPhenazepam is a benzodiazepine drug, which was developed in the Soviet Union in 1975, and now produced in Russia and some CIS countries. Phenazepam is used in the treatment of various mental disorders such as psychiatric schizophrenia and anxiety. Formula: C15N2H10OBrCl Molar mass: 349.61 g/mol Onset of action: 1.5–4 hours Elimination half-life: 6–18 hours (active metabolite unknown) Metabolism: Hepatic — aromatic oxidation and C3-hydroxylation Excretion: Renal Bioavailability: 16,7% (rat)