Excretion study of furazabol, an anabolic steroid, in human urine

Furazabol and 16-hydroxyfurazabol represented the most abundant peaks in urinary metabolic profiles for two men obtained by gas chromatography-mass spectrometry (GC-MS) after oral administration of 5 mg furazabol. The excreted amounts of unchanged furazabol were determined and its response in GC-MS was compared with that of the 16-hydroxy metabolite. The maximum excretion rates of these compounds were reached 2-3 h after oral administration. The half-lives of unchanged furazabol for two human subjects, were 1.87 and 1.29 h respectively and the recovered amount in 48 h was 24% (33% for one, 15% for the other). Also the spectrum of an unidentified metabolite is reported.