The principal clinical indication of drostanolone propionate in the United States as well as international markets was the treatment of advanced inoperable breast cancer in women.
Hormonal treatment is part of the complex therapy for some kind of tumors, particularly the ones associated with hormone-active tissues like breast or prostate cancer. Some types of breast cancer cells, expressing estrogen receptors (called ER+ cancers), use estrogen for their growth and dissemination. That is why drugs that block estrogen receptors or decrease their expression on the cell membrane, antiestrogens, could limit the tumor spread and size. Drostanolone propionate has been FDA approved as an antiestrogenic drug for the treatment of breast cancer. By the time of its release, there were not many alternatives for patients with breast cancer and drostanolone propionate was a revolution for these patients. As it has lower androgenic rate compared to testosterone, the risk of virilization is much lighter. Due to this fact, women, who usually do not respond well to any AAS, were having much greater chance to survive cancer. Drostanolone propionate can also be used for breast tumors that do not respond well to other treatments or also as palliative care for advanced incurable tumors. The effects of the product depend of course on the dose and period of administration. The risk of virilization becomes greater with high doses and continuous administration period.
Drostanolone propionate is or has been used for physique- and performance-enhancing purposes by competitive athletes, bodybuilders, and powerlifters.
Drostanolone propionate is a prodrug of drostanolone.[Like other AAS, drostanolone is an agonist of the androgen receptor (AR). It is not a substrate for 5α-reductase and is a poor substrate for 3α-hydroxysteroid dehydrogenase (3α-HSD), and therefore shows a high ratio of anabolic to androgenic activity.As a DHT derivative, drostanolone is not a substrate for aromatase and hence cannot be aromatized into estrogenic metabolites.While no data are available on the progestogenic activity of drostanolone, it is thought to have low or no such activity similarly to other DHT derivatives. Since the drug is not 17α-alkylated, it is not known to cause hepatotoxicity.
Drostanolone propionate, via its active form drostanolone, interacts with the AR and activates a cascade of genetic changes, including increased protein synthesis (anabolism) and decreased amino acid degradation (catabolism). It also induces a reduction or inhibition of prolactin or estrogen receptors in the breasts, which is linked to its antitumor effects