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LAST UPDATED:  SEPTEMBER 23, 2022

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Metandienone, also known as methandienone or methandrostenolone and sold under the brand name Dianabol among others, is an androgen and anabolic steroid (AAS) medication which is mostly no longer used. It is also used non-medically for physique- and performance-enhancing purposes. It is taken by mouth and by injection.

Side effects of metandienone include symptoms of masculinization like acne, increased hair growth, voice changes, and increased sexual desire, estrogenic effects like fluid retention and breast enlargement, and liver damage. The drug is an agonist of the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT), and has strong anabolic effects and moderate androgenic effects. It also has moderate estrogenic effects.

Metandienone was originally developed in 1955 by CIBA and marketed in Germany and the United States. As the CIBA product Dianabol, metandienone quickly became the first widely used AAS among professional and amateur athletes, and remains the most common orally active AAS for non-medical use. It is currently a controlled substance in the United States and United Kingdom and remains popular among bodybuilders. Metandienone is readily available without a prescription in certain countries such as Mexico, and is also manufactured in some Asian countries.

Medical uses
Metandienone was formerly approved and marketed for the treatment of hypogonadism.