Synonyms NSC-17591 PubChem CID 9416 | CAS Number 315-37-7 ChemSpider 9045 | |
 | ||
Routes of
administration Intramuscular injection Biological half-life 4.5 days (intramuscular) | ||
Testosterone enanthate (USAN, BAN) (brand names Delatestryl, Testostroval, Testro LA, Andro LA, Durathate, Everone, Testrin, Andropository), or testosterone heptanoate, is an androgen and anabolic steroid and a testosterone ester. Along with testosterone cypionate and testosterone propionate, it is one of the most widely used testosterone esters. Testosterone enanthate was first introduced in 1952. Administered via intramuscular injection, it is the most widely used form of testosterone in androgen replacement therapy.
Testosterone enanthate has an elimination half-life of 4.5 days and a mean residence time of 8.5 days when used as a depot intramuscular injection. It requires frequent administration of approximately once per week, and large fluctuations in testosterone levels result with it, with levels initially being elevated and supraphysiological.