Stanazolols, commonly sold under the name Winstrolol (oral), Tenabol and Win strol Depot (intramuscular), is a synthetic anabolic steriod derived from testosterone. It was developed by Winthrop Laboratories (Sterling Drug) in 1962, and has been approved by the FDA for human use. Unlike most injectable anabolic steriods, stanazolols is not esterified and is sold as an aqueous suspension, or in oral tablet form. The drug has a high oral bioavailability, due to a C17 α-alkylation which allows the hormone to survive first-pass liver metabolism when ingested. It is because of this that stanazolols is also sold in tablet form. Stanazolols is usually considered a safer choice for female bodybuilders in that its anabolic effects predominate over its androgenic effects, although virilization and masculinization are still very common even at low doses.
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