Halotest® Fluoxymesterone is an anabolic androgenic steroid, 17beta-hydroxysteroid, 11beta-hydroxysteroid, fluorinated steroid and 3-oxo-delta(4) steroid. It plays the role of an antitumor agent and anabolic agent. An anabolic steroid that has been used to treat male hypogonadism, delayed puberty in men, and to treat breast tumors in women. Fluoxymesterone is an androgen. The mechanism of action of fluoxymesterone is that it is an androgen receptor agonist.