Masteron (Drostanolone Propionate)
1 year ago

Masteron (Drostanolone Propionate)


Drostanolone propionate is an injectable anabolic steroid derived from dihydrotestosterone (DHT). Here, the DHT backbone has been modified with a 2-methyl group to increase its anabolic properties, making this agent significantly more effective at promoting the growth of muscle tissue than its non-methylated parent. Drostanolone propionate is described in product literature as a “steroid with powerful anabolic and anti-estrogenic properties,” and indeed does seem to share some of both properties. Admittedly, however, its anabolic properties are more properly described as moderate, especially when placed in the context of other agents. The drug is most often used by dieting bodybuilders and athletes in speed sports, where it is highly favored for its ability to produce solid increases in lean muscle mass and strength, which are usually accompanied by reductions in body fat level and minimal side effects.


Drostanolone propionate was first described in 1959. Syntex developed the agent alongside such other well-known steroids as Anadrol and methyldrostanolone (Superdrol), also first described in the same paper. Drostanolone propionate would be introduced as a prescription drug product approximately a decade later. Lilly had an agreement with Syntex to split certain research and development costs in exchange for the rights to market the results of that research. Lilly would, therefore, sell drostanolone propionate in the U.S. under the Drolban brand name, while Syntex would sell/license it in other markets. Products included Masteron in Belgium (Sarva-Syntex) and Portugal (Cilag), Masteril in the U.K. and Bulgaria, and Metormon in Spain. Drostanolone propionate was also found in such popular preparations as Permastril (Cassenne, France), Mastisol (Shionogi, Japan), and Masterid (Grunenthal, Germany Democratic Republic).

Structural Characteristics:

Drostanolone (also known as dromostanolone) is a modified form of dihydrotestosterone. It differs by the introduction of a methyl group at carbon-2 (alpha), which considerably increases the anabolic strength of the steroid by heightening its resistance to metabolism by the 3-hydroxysteroid dehydrogenase enzyme in skeletal muscle tissue. Drostanolone propionate is a modified form of drostanolone, where a carboxylic acid ester (propionic acid) has been attached to the 17-beta hydroxyl group. Esterified steroids are less polar than free steroids, and are absorbed more slowly from the area of injection. Once in the bloodstream, the ester is removed to yield free (active) drostanolone. Esterified steroids are designed to prolong the window of therapeutic effect following administration, allowing for a less frequent injection schedule compared to injections of free (unesterified) steroid. The half-life of drostanolone propionate is approximately two days after injection.

Side Effects (Estrogenic):

Drostanolone is not aromatized by the body, and is not measurably estrogenic. An anti-estrogen is not necessary when using this steroid, as gynecomastia should not be a concern even among sensitive individuals. Since estrogen is the usual culprit with water retention, drostanolone instead produces a lean, quality look to the physique with no fear of excess subcutaneous fluid retention.This makes it a favorable steroid to use during cutting cycles, when water and fat retention are major concerns. As a non-aromatizable DHT derivative, drostanolone may impart an anti-estrogenic effect, the drug competing with other (aromatizable) substrates for binding to the aromatase enzyme.

Side Effects (Androgenic):

Although classified as an anabolic steroid, androgenic side effects are still possible with this substance, especially with higher than normal therapeutic doses. This may include bouts of oily skin, acne, and body/facial hair growth.

Anabolic/androgenic steroids may also aggravate male pattern hair loss. Women are warned of the potential virilizing effects of anabolic/androgenic steroids. These may include a deepening of the voice, menstrual irregularities, changes in skin texture, facial hair growth, and clitoral enlargement. Drostanolone is a steroid with relatively low androgenic activity relative to its tissue-building actions, making the threshold for strong androgenic side effects comparably higher than with more androgenic agents such as testosterone, methandrostenolone, or fluoxymesterone. Note that drostanolone is unaffected by the 5-alpha reductase enzyme, so its relative androgenicity is not affected by the concurrent use of finasteride or dutasteride.

Side Effects (Hepatotoxicity):

Drostanolone is not c17-alpha alkylated, and not known to have hepatotoxic properties. Liver toxicity is unlikely.


•     (Drostanolone Propionate)
•     [17beta-Hydroxy-2alpha-methyl-5alpha-androstan-3-one propionate]
•     Molecular Weight: 360.5356
•     Formula: C23H36O3
•     Melting Point: N/A
•     Manufacturer: Syntex (originally), Various Underground Labs
•     Effective Dose (men): 350mgs/week (*100mgs Every other day) to 500mgs/week
•     Effective Dose (woman): 50-100mg/week
•     Active Life:2-3 days
•     Detection time: 3 weeks
•     Anabolic/Androgenic Ratio: 62:25