Cloxotestosterone acetate

Cloxotestosterone acetate
Clinical data
Trade names Caprosem
Routes of
Intramuscular injection
Synonyms Testosterone 17β-chloral hemiacetal O-acetate; 17β-(1-(Acetyloxy)-2,2,2-trichloroethoxy)androst-4-en-3-one
CAS Number 13867-82-8
PubChem (CID) 20056698
ChemSpider 16739648
Chemical and physical data
Formula C23H31Cl3O4
Molar mass 477.847 g/mol
3D model (Jmol) Interactive image

Cloxotestosterone acetate (INN; brand name Caprosem), also known as testosterone 17β-chloral hemiacetal O-acetate, as well as 17β-(1-(acetyloxy)-2,2,2-trichloroethoxy)androst-4-en-3-one, is a synthetic, injected anabolic-androgenic steroid (AAS) and an androgen ether and ester – specifically, the O-acetate ester of cloxotestosterone, the 17β-chloro hemiacetal ether of testosterone.[1] It is administered via intramuscular injection as a 100 mg, 2 mL aqueous suspension and lasts 4 to 6 weeks with a single administration.[2] The drug was first marketed in the early 1960s.[2]

See also


  1. J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 641–. ISBN 978-1-4757-2085-3.
  2. 1 2 Advertisements. Proceedings of the Royal Society of Medicine. 1963;56(1):21.

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