Drostanolone propionate, or dromostanolone propionate, sold under the brand names Drolban, Masteril, and Masteron among others, is an androgen and anabolic steroid (AAS) medication which was used to treat breast cancer in women but is now no longer marketed. It is given by injection into muscle. Masteron is an aromatase inhibitor which means that it will prevent testosterone or other compounds from aromatizing into estrogen. So, you will experience reduced bloating and no gyno. … One of the best features of masteron is its strong anti-estrogenic properties.A: Proviron (oral 1-methyl-dihydrotestosterone) and Masteron (an injectable form of 2-methyl-dihydrotestosterne) are indeed structurally very similar. … Both steroids are DHT derivatives, yes, and because of this there is no estrogen conversion possible with either drug.Drostanolone, or dromostanolone, is an anabolic–androgenic steroid of the dihydrotestosterone group which was never marketed. An androgen ester prodrug of drostanolone, drostanolone propionate, was formerly used in the treatment of breast cancer in women under brand names such as Drolban, Masteril, and Masteron.