Clinical data
Trade names Myagen, Methosarb
Synonyms U-19763; NSC-66233; 7α,17α-Dimethyltestosterone; 7α,17α-Dimethylandrost-4-en-17β-ol-3-one
Routes of
By mouth
CAS Number
PubChem CID
ECHA InfoCard 100.015.018
Chemical and physical data
Formula C21H32O2
Molar mass 316.485 g/mol
3D model (JSmol)

Bolasterone (INN, USAN) (brand names Myagen, Methosarb; former developmental code name U-19763), also known as 7α,17α-dimethyltestosterone, is a 17α-alkylated androgen/anabolic steroid (AAS) which is used in veterinary medicine.[1][2] It has close structural similarity to testosterone (medication)|testosterone, and like methyltestosterone has a methyl group at C17α in order to increase oral bioavailability.[1] In addition, it is also 7α-methylated, similar to its 7β-methylated isomer calusterone.[1] The medication has a low to moderate ratio of anabolic to androgenic activity, similar to that of fluoxymesterone.[3]


  1. 1 2 3 J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 646–. ISBN 978-1-4757-2085-3.
  2. I.K. Morton; Judith M. Hall (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 52–. ISBN 978-94-011-4439-1.
  3. Charles D. Kochakian (6 December 2012). Anabolic-Androgenic Steroids. Springer Science & Business Media. pp. 377,401. ISBN 978-3-642-66353-6.

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