PT - JOURNAL ARTICLE AU - F S Eberts, Jr TI - Disposition of triazolam, 8-chloro-6-(o-chlorophenyl)-1-methyl-4H-s-triazolo[4,3-a]benzodiazepine, in the dog. DP - 1977 Nov 01 TA - Drug Metabolism and Disposition PG - 547--555 VI - 5 IP - 6 4099 - http://dmd.aspetjournals.org/content/5/6/547.short 4100 - http://dmd.aspetjournals.org/content/5/6/547.full SO - Drug Metab Dispos1977 Nov 01; 5 AB - Disposition of triazolam (T), a new, potent, hypnotic agent, was studied in the dog. A single 0.5-mg/kg oral or iv dose of 14C-labeled T was rapidly absorbed, and although 88% was bound to serum proteins, T levels decreased with a half-life of 0.85 hr. Metabolism of T was rapid, with a first-pass effect observed after oral administration. Excretion of drug-related materials was rapid; urinary and fecal excretion of 14C were equal. Urine contained no measurable T, and metabolites were mostly conjugated. The major urinary metabolite was the alpha-HT analog of T, resulting from oxidation of the 1-methyl group of the triazole moiety. Other metabolites identified were the 4-hydroxy and alpha,4-hHT analogs of T, as well as the 1-demethyl analog, which probably results from further oxidation of alpha-hydroxy-T. Evidence also was obtained for two other monohydroxy analogs plus a dihydroxy, monohydroxymonomethoxy, and a dihydroxymonomethoxy analog of triazolam.