title: Multiple-dose halazepam kinetics.
abstract: Halazepam is a benzodiazepine used in the management of anxiety disorders or short-term relief of anxiety. Our study was undertaken to evaluate its steady-state kinetics and those of its major active plasma metabolite N- desalkylhalazepam . Eleven healthy men aged 19 to 35 yr were given oral, 40-mg halazepam tablets every 8 hr for 14 days. Plasma samples were analyzed by gas chromatography to determine levels of halazepam and N- desalkylhalazepam . Halazepam kinetics can best be described by a two-compartment open model with first-order absorption kinetics. The elimination phase t1/2s of halazepam and N- desalkylhalazepam were 34.7 and 57.9 hr. Steady-state levels were predictable from kinetic data and were reached by the third day for halazepam and by the eleventh day for N- desalkylhalazepam .
mesh_terms: D000328:Adult; D014151:Anti-Anxiety Agents / Q000097:blood / Q000378:metabolism*; D001569:Benzodiazepines; D001570:Benzodiazepinones / Q000097:blood / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D008297:Male; D003708:Nordazepam / Q000097:blood
chemical_list: D014151:Anti-Anxiety Agents; D001570:Benzodiazepinones; D001569:Benzodiazepines; C010175:halazepam; D003708:Nordazepam