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• Effective substance: Drostanolone propionate       
  
• Content: 100mg/ml
• BOX: with 1x 10ml vial
  
• Administration:  intramuscular injection
• Known as: Masteron

Drostanolone propionate (BAN) (brand names Masteron, Drolban, others), also known as dromostanolone propionate (USAN), as well as 2α-methyl-4,5α-dihydrotestosterone, is a synthetic anabolic-androgenic steroid (AAS) and the propionate ester of drostanolone. It is incapable of aromatization and has similar properties to dihydrotestosterone (DHT).[citation needed] It has been successfully used to treat breast cancer, but because of the high risk of virilization, options with better tolerability are usually prescribed instead. Drostanolone propionate is not orally active and must be administered instead via intramuscular injection.

Dromostanolone is a synthetic androgen, or male hormone, similar to testosterone. Dromostanolone works by attaching itself to androgen receptors; this causes it to interact with the parts of the cell involved in the making of proteins. It may cause an increase in the synthesis of some proteins or a decrease in the synthesis of others. These proteins have a variety of effects, including blocking the growth of some types of breast cancer cells, stimulating cells that cause male sexual characteristics, and stimulating the production of red blood cells.