Methandrostenolone is a synthetic anabolic-androgenic steroid, which is derived from testosterone. It is also known as methandienone or Dianabol. This drug is commonly used by bodybuilders and athletes for its ability to increase muscle mass, strength, and stamina. However, it has significant adverse effects, including increased risk of cardiovascular disease, liver damage, and hormonal imbalances. Therefore, its use is regulated and often illegal without a prescription.