Metenolone Enanthate (Primobolan Depot / Nibal Injection)

Metenolone enanthate, also known as methenolone enanthate, and sold under the brand names Primobolan Depot and Nibal Injection, is an androgen and anabolic steroid (AAS) medication mainly used in the treatment of anemia due to bone marrow failure. It is administered via injection into muscle.

Although it was widely used in the past, the drug has mostly been discontinued and is now mostly only available on the black market. A related drug, metenolone acetate, is taken by mouth.

Side Effects

Side effects of metenolone enanthate include symptoms of masculinization, such as:

• Acne

• Increased hair growth

• Voice changes

• Increased sexual desire

Mechanism of Action

The drug is a synthetic androgen and anabolic steroid, and functions as an agonist of the androgen receptor (AR), which is the biological target of androgens like testosterone and dihydrotestosterone (DHT).

It has:

• Moderate anabolic effects

• Weak androgenic effects

• No estrogenic effects

• No risk of liver damage

Metenolone enanthate is a metenolone ester and serves as a long-lasting prodrug of metenolone in the body.

History and Availability

Metenolone enanthate was introduced for medical use in 1962. In addition to its medical application, it is used to improve physique and performance.

The drug is a controlled substance in many countries, and therefore non-medical use is generally illicit. It remains marketed for medical use only in a few countries, such as Spain and Turkey.