Orally administered Winstrol has a half-life in the body of about nine hours. Injected Winstrol has a half-life in the body of around 24 hours, according to the Association Against Steroid Abuse. Winstrol, also called stanozolol, is an anabolic steroid.
Winstrol was first synthesized in the 1960s. It is similar in structure to testosterone and has been a popular drug of abuse among bodybuilders and athletes due to its strong anabolic effects and only limited androgenic effects, says the Association Against Steroid Abuse.
Common side effects of Winstrol include liver damage, acne, voice changes, hair loss and facial hair growth. Other side effects include breast enlargement in men, changes in libido, headache and difficulty sleeping, according to Drugs.com.