In February 2009, Sports Illustrated reported that Alex Rodriguez tested positive for two AAS, testosterone and metenolone enanthate, while playing for the Texas Rangers in 2003. He claims to have purchased them over the counter, in the Dominican Republic . However, " boli ," as he referred to it, is an illegal substance in the Dominican Republic.   In an interview with ESPN two days after the SI revelations, Rodriguez admitted to using banned substances from 2001 to 2003, citing "an enormous amount of pressure to perform," but said he had not since then used banned performance-enhancing substances.   He said he did not know the name(s) of the particular substance(s) he was using, and would not specify whether he took them in injectable form. 
Stanozolol is a highly modified version of dihydrotestosterone, a synthetic one. Initially, this drug was released on the market called Winstrol. In it, in the traditional and familiar structure of steroids with the presence of the A-ring, an additional system of rings was added. Stenozolone has rather weak binding abilities, as it does not bind well enough to the androgen receptor. But the period of his half-life, which lasts nine hours, can be considered quite long, as for this steroid. And this is also one of the factors that led to its low binding ability. This steroid can not be converted into a metabolite of estrogen by the procedure of aromatization, besides, it is already reduced to 5-alpha. Therefore, further reduction is not possible. But at the same time it has a small capacity for anti-aromatism. Also, Stanozolol is very poorly associated with the SGHG – globulin, which binds the sex hormone. Because of this, in the overwhelming majority of cases, it is in a free state. Although directly interacting with the glucocorticoid receptors, Stanozolol does not interact, it can enter into a reaction with the protein STBP, which binds the glucocorticoid. As a result, the bound cortisol is pushed out and begins to circulate freely. At the same time, there is scientifically confirmed data that stanozolol exerts its influence and releases cortisol from the suprarenals. As a result, his level goes down, especially if you take this medication on an ongoing basis. If you stop taking a steroid, you can get a “ricochet” effect, as a result of which the production of cortisol by the body increases dramatically. Among other things, taking the drug can cause severe pain in all joints.