Metenolone acetate, or methenolone acetate, sold under the brand names Primobolan and Nibal, is an androgen and anabolic steroid (AAS) medication which is used mainly in the treatment of anemia due to bone marrow failure.

[5] Side effects of metenolone acetate include symptoms of masculinization like acne, increased hair growth, voice changes, and increased sexual desire.

[8][5] In addition to its medical use, metenolone acetate is used to improve physique and performance.

[5] The drug is a controlled substance in many countries and so non-medical use is generally illicit.

[1][2][5] Metenolone acetate was first introduced for medical use in West Germany in 1961 under the brand name Primobolan and in the United States in 1962.