 It is eliminated in the urine, with less than 5% excreted unchanged.Fluoxymesterone, also known as 9α-fluoro-11β-hydroxy-17α-methyltestosterone or as 9α-fluoro-17α-methylandrost-4-en-11β,17β-diol-3-one, is a synthetic androstane steroid and a 17α-alkylated derivative of testosterone (androst-4-en-17β-ol-3-one).It is specifically the derivative of testosterone with a fluorine atom at the C9α position, a hydroxyl group at the C11β position, and a methyl group at the C17α position.