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n. A synthetic androgenic anabolic steroid.


Clostebol ( INN) (brand names Steranabol, Test-Anabol), also known as 4-chlorotestosterone, usually as the ester clostebol acetate, is a synthetic anabolic androgenic steroid. Clostebol is the 4- chloro derivative of the natural hormone testosterone. The chlorination prevents conversion to dihydrotestosterone (DHT) while also rendering the chemical incapable of conversion to estrogen.

It is a weak anabolic steroid which was used as a performance enhancing drug. It is currently banned by the World Anti-Doping Agency. It was used by athletes from the East Germany.

Use of clostebol has led to the suspension of a number of athletes in various sports including Freddy Galvis of the Philadelphia Phillies in 2012, Dee Gordon of the Miami Marlins in 2016, and Olympic athlete Viktoria Orsi Toth in 2016.