Methenolone Enanthate CAS 303-42-4

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Methenolone Enanthate CAS 303-42-4

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CAS 303-42-4 Basic Parameter

Product Name Methenolone enanthate
Synonyms 4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl]heptanoate;MethenoloneEnanthate(PriMobolan);NSC64967;PrimonabolDepot;SH601;SQ16374;17-Hydroxy-1-methyl-5-androst-1-en-3-one-17-enanthate
CAS NO 303-42-4
Molecular Formula C27H42O3
Molecular Weight 414.62
EINECS 206-141-6
Melting Point 70-70.5 °C
Boiling Point 504.3±50.0 °C(Predicted)
Density 1.05±0.1 g/cm3(Predicted)
Solubility DMF: 30 mg/ml; dimethyl sulfoxide: 11 mg/ml; ethanol: 25 mg/ml
Appearance Crystalline solid

Metenolone enanthate Picture

methenolone enanthate, metenolone enanthate, cas 303-42-4

Metenolone enanthate, or methenolone enanthate is an androgen and anabolic steroid (AAS) medication which is used mainly in the treatment of anemia due to bone marrow failure. It is given by injection into muscle. Although it was widely used in the past, the drug has mostly been discontinued and hence is now mostly only available on the black market.  A related drug, metenolone acetate, is taken by mouth.

Side effects of metenolone enanthate include symptoms of masculinization like acne, increased hair growth, voice changes, and increased sexual desire. The drug is a synthetic androgen and anabolic steroid and hence is an agonist of the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT). It has moderate anabolic effects and weak androgenic effects, as well as no estrogenic effects or risk of liver damage. Metenolone enanthate is a metenolone ester and a long-lasting prodrug of metenolone in the body.

Medical uses

Metenolone enanthate has been studied in the treatment of breast cancer.


As a derivative of DHT, metenolone, the active form of metenolone enanthate, is not aromatized, and so has no propensity for producing estrogenic side effects like gynecomastia. As an AAS, metenolone enanthate is antigonadotropic and can suppress the hypothalamic–pituitary–gonadal axis and produce reversible hypogonadism and infertility.


Metenolone enanthate, or metenolone 17β-enanthate, is a synthetic androstane steroid and a derivative of DHT. It is the C17β enanthate (heptanoate) ester of metenolone, which itself is 1-methyl-δ1-4,5α-dihydrotestosterone (1-methyl-δ1-DHT) or 1-methyl-5α-androst-1-en-17β-ol-3-one.

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