Clinical data
Routes of
Synonyms 17α-Demethylstanozolol 17β-tetrahydropyran ether; 17β-Hydroxy-5α-androstano[3,2-c]pyrazole 17β-tetrahydropyran ether; [3,2-c]Pyrazole-5α-etioallocholane-17β-tetrahydropyranol
CAS Number 1186001-41-1
PubChem (CID) 56842253
ChemSpider 32700007 YesY
Chemical and physical data
Formula C25H38N2O2
Molar mass 398.580 g/mol
3D model (Jmol) Interactive image

Prostanozol, also known as demethylstanozolol tetrahydropyran ether, is an androgenic-anabolic steroid (AAS) and designer steroid which acts as a prodrug of the 17α-demethylated analogue of stanozolol (Winstrol). It was found in 2005 as an ingredient of products sold as "dietary supplements" for bodybuilding.[1]

It is one of hundreds of drugs banned from the Olympics by the IOC.[2] Russian marathon runner Lyubov Denisova was banned for two years from competition after testing positive for prostanozol and testosterone in 2007.[3]


  1. Eenoo PV, Delbeke FT. Metabolism and excretion of anabolic steroids in doping control—New steroids and new insights. Journal of Steroid Biochemistry and Molecular Biology. 2006;101(4-5):161-178. doi:10.1016/j.jsbmb.2006.06.024
  2. "192 Banned Performance Enhancing Substances and Methods". March 17, 2010. Retrieved July 25, 2015.
  3. "Russian marathon runner Denisova banned for 2 years for doping". USA Today. May 15, 2007. Retrieved July 25, 2015.

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