Prostanozol, also known as demethylstanozolol tetrahydropyran ether, is an androgen/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]

Clinical data
Other names17α-Demethylstanozolol 17β-tetrahydropyran ether; 17β-[(Tetrahydro-2H-pyran-2-yl)oxy]-5α-androst-2-eno[3,2-c]pyrazole; [3,2-c]Pyrazole-5α-etioallocholane-17β-tetrahydropyranol; 17β-[(Tetrahydro-2H-pyran-2-yl)oxy]-2'H-5α-androst-2-eno[3,2-'c]pyrazole; Pyrazolo[4',3':2,3]-5α-androstan-17β-ol 17β-tetrahydropyran ether
Routes of
By mouth
Drug classAndrogen; Anabolic steroid; Androgen ether
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass398.591 g·mol−1
3D model (JSmol)

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 (2006). "Metabolism and excretion of anabolic steroids in doping control—New steroids and new insights". Journal of Steroid Biochemistry and Molecular Biology. 101 (4–5): 161–178. doi:10.1016/j.jsbmb.2006.06.024. PMID 17000101. S2CID 33621513.
  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.