Drostanolone propionate is a synthetic anabolic-androgenic steroid derived from dihydrotestosterone (DHT), originally developed by Lilly as a treatment for advanced breast cancer. It’s more commonly known by its brand name, Masteron. While it was once used medically to lower cholesterol and fight certain cancers, it is now primarily associated with bodybuilding and athletic performance enhancement, and it is classified as a Schedule III controlled substance in the United States.
Origins as a Cancer Treatment
Drostanolone propionate was developed as an antineoplastic agent, meaning it was designed to slow or stop tumor growth, specifically in women with advanced breast cancer. Its ability to inhibit estrogen production made it useful in treating hormone-sensitive tumors, since many breast cancers rely on estrogen to grow. It was also investigated for its ability to lower plasma cholesterol levels.
Despite its medical history, the compound never received formal FDA approval. Over time, newer and more targeted breast cancer therapies replaced it, and its medical use essentially disappeared. What remained was its reputation in bodybuilding circles for producing a lean, hard physique without the water retention common to other steroids.
How It Works in the Body
Drostanolone propionate’s full chemical name is 2α-methyl-4,5α-dihydrotestosterone 17β-propionate. In practical terms, it’s a modified version of DHT, one of the body’s naturally occurring androgens. The key modification is a methyl group at the second carbon position, which changes how the body processes the compound and makes it more resistant to being broken down.
Like other androgenic steroids, drostanolone works by binding to androgen receptors in muscle and other tissues. Once bound, it triggers the same signaling pathways that natural testosterone activates, promoting protein synthesis and muscle preservation. What sets it apart from many other steroids is its relationship to estrogen. Drostanolone and its ester derivatives have the ability to inhibit the production of estrogen. This anti-estrogenic property is why it was once valued in breast cancer treatment and why bodybuilders prize it for producing a dry, defined look rather than the puffy, water-retaining appearance that estrogen-promoting steroids can cause.
The “propionate” part of the name refers to the short-chain ester attached to the base compound. Esters control how quickly a steroid is released into the bloodstream after injection. Propionate is one of the shortest esters used, which means the drug enters and leaves the body relatively fast. Research on similar propionate esters shows they have the most rapid elimination and shortest half-life among common steroid esters, though they can still be detected in blood for four to five days after administration.
How It’s Used for Performance Enhancement
In bodybuilding, drostanolone propionate is typically injected at doses of 100 to 150 mg every other day. The frequent injection schedule is a direct consequence of the short-acting propionate ester. Miss a day, and blood levels drop noticeably. This is one reason some users prefer longer-acting versions like drostanolone enanthate, which require less frequent injections.
Bodybuilders generally use drostanolone propionate during “cutting” phases, when the goal is to shed body fat while preserving muscle mass. It doesn’t cause significant weight gain on its own and isn’t considered a mass-building steroid. Instead, its value lies in its ability to create a harder, more defined appearance, particularly when body fat is already low. It’s also popular in the weeks leading up to competitions, partly because of its anti-estrogenic effects, which reduce subcutaneous water retention and give muscles a more chiseled look.
Side Effects and Health Risks
Because drostanolone is a DHT derivative, its side effects lean heavily androgenic rather than estrogenic. That means it doesn’t typically cause breast tissue growth in men (gynecomastia) or significant water retention, but it does carry the classic androgenic risks: accelerated hair loss in people genetically prone to male-pattern baldness, oily skin, acne, and potential prostate enlargement with prolonged use. Women who use it risk developing masculine features like a deeper voice, facial hair growth, and menstrual irregularities.
Like all anabolic steroids, drostanolone propionate suppresses the body’s natural testosterone production. After a cycle, it can take weeks or months for hormonal function to recover, and some users experience fatigue, low libido, and mood changes during that period. The compound also affects cardiovascular health by shifting cholesterol levels in an unfavorable direction, raising LDL (the harmful type) while lowering HDL (the protective type). Over time, this increases the risk of heart disease, particularly for long-term or high-dose users.
Liver toxicity is less of a concern with drostanolone than with oral steroids, since it’s injected and doesn’t pass through the liver the way oral compounds do. However, no anabolic steroid is without systemic effects, and repeated use still places strain on the cardiovascular and endocrine systems.
Legal Status and Detection
In the United States, anabolic steroids including drostanolone propionate are Schedule III substances under the Controlled Substances Act. Possessing them without a prescription is a federal offense, and distributing them carries steeper penalties. Similar laws exist in the United Kingdom, Canada, and Australia, though enforcement and specific classifications vary.
Drostanolone is also banned by the World Anti-Doping Agency (WADA) and all major sports organizations. Drug testing has become increasingly sensitive to its metabolites. Even with the propionate ester’s relatively short activity in the body, detection windows extend well beyond the point where the drug stops producing performance effects. Athletes have been caught and sanctioned months after their last injection based on long-lasting metabolites that remain in urine samples.