Drostanolone Propionate

Drostanolone Propionate is an anabolic androgenic steroid that entered the market around 1970 under the name Masteron, produced by Syntex. Interestingly, the compound had actually been created much earlier, in 1959, during the same period Syntex developed Oxymetholone. While Oxymetholone was released first, drostanolone followed years later. Over time, it was sold under several brand names, including Masteril, Metormon, and Drolban, but Masteron became the most widely recognized.

Medically, Masteron was used for roughly two decades, primarily in treating advanced, inoperable breast cancer in postmenopausal women. Eventually, newer therapies replaced it, and pharmaceutical production was discontinued almost entirely worldwide. Although it still holds FDA approval in the United States, it is rarely prescribed today. In the performance world, however, Masteron remains highly valued, especially among competitive bodybuilders who often consider it a staple during contest preparation.

Masteron: Functions and Characteristics

Drostanolone Propionate is derived from dihydrotestosterone (DHT). Chemically, it is DHT modified by adding a methyl group at the carbon 2 position. This alteration protects the hormone from rapid breakdown in muscle tissue by the 3-hydroxysteroid dehydrogenase enzyme and enhances its anabolic properties. The propionate ester attached to the hormone controls how quickly it is released into the bloodstream, which means injections are required more frequently compared to longer esters.

An enanthate version is available through some underground sources and requires less frequent injections, but the propionate form remains far more common.

One of the most distinctive qualities of Masteron is its strong anti estrogenic nature. It does not convert to estrogen and can even act in an anti estrogen capacity within the body. This explains its historical effectiveness in breast cancer treatment, often paired with Tamoxifen. For physique athletes, this characteristic is particularly useful because it supports a harder, drier look during cutting phases and may reduce the need for additional anti estrogen medication in certain cycles.

Although its anabolic and androgenic ratings appear moderate on paper, those numbers do not fully reflect how it performs. Since it is DHT based, it binds strongly to the androgen receptor, which contributes to muscle hardness and can assist with fat loss. While nearly all anabolic steroids enhance metabolic rate to some degree, stronger androgens are often associated with direct fat breakdown. Even so, Masteron is not known for adding large amounts of muscle mass. It is rarely used in therapeutic settings for muscle wasting and is most often included in cutting cycles. That said, it can deliver noticeable strength gains, which may benefit athletes who prioritize performance over size.

Effects of Masteron

Masteron shows its greatest value during cutting cycles, particularly when body fat levels are already low. The leaner the individual, the more visible the results. This is why it is commonly introduced toward the end of a contest prep phase, once most excess fat has already been lost. At that stage, it can help refine the physique by tightening up stubborn areas and enhancing overall hardness. Its anti estrogen effect further contributes to a dry and defined appearance.

For individuals who are not extremely lean, the visual impact may be less dramatic. Those below about 10 percent body fat are more likely to notice clear changes, while higher body fat levels may limit how much difference is seen.

As a strong androgen, Masteron can also support strength levels. This can be especially helpful for athletes dieting to maintain a specific weight class. It may allow for moderate strength improvements and better recovery without significant weight gain.

When it comes to bulking, however, Masteron is not an ideal choice. Even at higher doses, muscle gains tend to be modest, similar to milder compounds such as Primobolan. Many other anabolic steroids are better suited for size focused cycles. Some users consider adding Masteron during off season phases for its anti estrogen and mild fat control benefits, but these advantages alone usually do not justify its use in heavy bulking programs. In cycles that include high doses of testosterone, nandrolone, trenbolone, or oral compounds like Dianabol or Anadrol, estrogen activity can become substantial. Masteron’s anti estrogen effect is not strong enough to fully counteract that level of hormonal activity.

Side Effects of Masteron

Overall, Masteron is often described as relatively manageable in terms of side effects. While risks do exist, many men tolerate it well when used responsibly. Women, however, must be more cautious due to the potential for virilization.

Estrogenic Effects

Masteron does not aromatize and has no progestin activity. As a result, estrogen related side effects such as gynecomastia and water retention are not caused by this steroid. Elevated blood pressure linked to fluid retention is also unlikely. Although Masteron itself does not require anti estrogen medication, other compounds in a cycle may still make it necessary.

Androgenic Effects

Most potential side effects are androgen related. These may include acne, increased body hair, and accelerated hair loss in men who are genetically prone to male pattern baldness. Even though its overall androgenic rating is considered moderate, Masteron is well known for speeding up hair loss in susceptible individuals.

It is important to understand that drostanolone is already a DHT derivative. The 5 alpha reductase enzyme, which converts testosterone into DHT, does not further metabolize it. Because of this, medications like finasteride will not reduce its androgenic effects.

Women using Masteron may experience virilization symptoms such as voice deepening, increased body hair growth, and clitoral enlargement. In medical settings, these effects were commonly observed at high doses. In performance settings, lower doses may reduce the risk, but sensitivity varies. If symptoms appear, stopping use immediately usually allows them to reverse. Continuing despite symptoms increases the risk of permanent changes.

Cardiovascular Effects

Masteron can negatively influence cholesterol levels. It may raise LDL cholesterol and lower HDL cholesterol, with the reduction in HDL often being more pronounced. While its impact is typically less severe than that of many oral steroids, it can be more significant than what is seen with testosterone or nandrolone.

There may also be a mild effect on blood pressure, although this is uncommon in otherwise healthy individuals.

Given these factors, maintaining cardiovascular health is essential. A balanced diet rich in omega fatty acids, low in saturated fats and simple sugars, along with consistent cardiovascular exercise, is strongly recommended. Anyone with existing cholesterol issues should avoid this compound.

Testosterone Suppression

Masteron significantly reduces natural testosterone production. For men, using external testosterone alongside it is necessary to prevent low testosterone symptoms. Many users prefer to keep testosterone doses moderate during cutting cycles to limit estrogen related effects, with 100 to 200 mg per week often sufficient to maintain normal function.

After discontinuing Masteron and once all anabolic hormones have cleared the body, natural testosterone production will gradually recover. This process takes time and does not happen overnight. Post Cycle Therapy is commonly used to stimulate hormone production and shorten the recovery period, although full restoration to baseline levels can still take several months. Successful recovery assumes there was no prior hormonal imbalance and no lasting damage to the hypothalamic pituitary testicular axis.

Hepatotoxicity

Masteron is not toxic to the liver and does not place stress on hepatic function.