Testosterone phenylbutyrate

Testosterone phenylbutyrate
Clinical data
Routes of
Intramuscular injection
Synonyms Testosterone phenylbutanoate; Testosterone 17β-phenylbutanoate; Androst-4-en-17β-ol-3-one 17β-phenylbutyrate
Chemical and physical data
Formula C29H38O3
Molar mass 434.62 g/mol
3D model (Jmol) Interactive image

Testosterone phenylbutyrate, or testosterone phenylbutanoate, also known as testosterone 17β-phenylbutyrate, as well as androst-4-en-17β-ol-3-one 17β-phenylbutyrate, is a synthetic, injected anabolic-androgenic steroid (AAS) and an androgen ester – specifically, the C17β phenylbutyrate (phenylbutanoate) ester of testosterone – which was never marketed.[1] It is a prodrug of testosterone and, when administered via intramuscular injection, is associated with a long-lasting depot effect and extended duration of action.

See also


  1. Samuel H. Yalkowsky; Yan He; Parijat Jain (19 April 2016). Handbook of Aqueous Solubility Data, Second Edition. CRC Press. pp. 1328–. ISBN 978-1-4398-0246-5.

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