Winstrol

Winstrol is a trade name for stanozolol, a synthetic anabolic-androgenic steroid (AAS) belonging to the dihydrotestosterone (DHT) family of androgens ^[1]. Structurally it is set apart by a pyrazole ring fused to the A-ring of the steroid nucleus and by a methyl group at the 17-alpha position; the latter modification blocks rapid breakdown in the liver and gives the drug meaningful activity when swallowed ^[1]. Because it is already 5-alpha-reduced, it is not converted into more potent androgens and is not aromatized to estrogen ^[1].

The compound was developed by Winthrop Laboratories and introduced in the United States in 1962; it was marketed as Winstrol in the Americas and as Stromba in parts of Europe, in both oral tablet and injectable aqueous forms ^[1]. Recognized medical uses have included the long-term prevention of attacks of hereditary angioedema and the management of certain anemias, and the drug has also been applied to some skin disorders and used in veterinary medicine to support weight gain and red-cell production ^[1]. Marketing approval for human use in the United States was later withdrawn ^[1].

Stanozolol is best known outside medicine for its role in doping. Anabolic steroids were banned from Olympic sport during the 1970s, and stanozolol became a defining example of the problem when a sprinter was stripped of a gold medal at the 1988 Seoul Olympics after testing positive for it ^[1]. A recurring safety concern with 17-alpha-alkylated steroids such as stanozolol is liver injury; animal studies report that prolonged treatment can raise markers of hepatic oxidative stress and disturb liver and kidney biochemistry ^[2][3].

In the United States, stanozolol is a Schedule III controlled substance under the Anabolic Steroids Control Act, and it is similarly restricted in many other countries ^[1]. It is listed as a prohibited substance by anti-doping authorities and can be detected in urine testing ^[1].

Winstrol (stanozolol) is a C17-alpha-alkylated steroid, so the oral form is hepatotoxic and can raise liver enzymes and, with prolonged use, cause cholestasis or other liver injury. It is notorious for markedly suppressing HDL cholesterol and worsening the lipid profile, imposing meaningful cardiovascular and atherogenic strain. Users commonly report joint dryness, aching, and heightened tendon/ligament vulnerability, since it reduces synovial fluid and collagen support. It does not aromatize, so estrogenic effects are absent, but it still suppresses the HPT axis and carries strong virilization risk in women (voice changes, hirsutism) that can be irreversible.