Winstrol (generic name stanozolol) is a synthetic anabolic steroid derived from dihydrotestosterone (DHT), formerly used to treat conditions like hereditary angioedema and anemia.
- Function: It promotes protein synthesis, red blood cell production, and nitrogen retention. [
- Availability: The brand-name drug is no longer commercially manufactured or available in the U.S., though generic versions or specialized formulations can occasionally be found via compounding pharmacies.
- Regulation: It is classified as a Schedule III controlled substance in the United States due to risks of misuse and abuse.
- Veterinary Use: It has been used off-label in veterinary medicine for animals like dogs, cats, and horses to treat weight loss or chronic debilitating conditions.
- Cutting Cycles: Athletes and bodybuilders have used Winstrol during “cutting” phases to reduce water retention and promote a lean, hard, vascular appearance.
- Performance Ban: It is banned by major sports organizations, including the World Anti-Doping Agency (WADA) and the International Olympic Committee, because it acts as an illegal performance-enhancing drug.
- Liver Toxicity: Because it is structurally altered (C17-alpha alkylated) to survive passing through the liver, it can cause severe hepatic stress, elevated liver enzymes, or liver damage.
- Cardiovascular Strain: It can negatively impact cholesterol by lowering “good” HDL cholesterol and raising “bad” LDL cholesterol, increasing the risk of high blood pressure and cardiovascular events.
- Hormonal Suppression: It shuts down natural testosterone production, leading to issues like testicular atrophy, low libido, and post-cycle erectile dysfunction.
- Virilization: In women, it can cause irreversible physical changes such as deepening of the voice, facial hair growth, and menstrual irregularities.




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