Dromostanolone propionate (Drostanolone propionate) is a compound has antitumor activity against breast carcinoma. Dromostanolone propionate inhibits the uptake of oestradiol-17ß by the tumour but has no apparent effect on the uptake by normal breast tissue . Dromostanolone propionate implant pellet produces weight gains in animals and suppresses estrus in female animals.