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The elimination half-life of testosterone in the blood or by intravenous injection is only about 10 minutes. [ 8 ] [ 33 ] Conversely, testosterone and testosterone esters in oil solution or crystalline aqueous suspension administered by intramuscular or subcutaneous injection have much longer half-lives, in the range of days to months, due to ...
Testosterone cypionate is a prodrug of testosterone and is an androgen and anabolic–androgenic steroid (AAS). That is, it is an agonist of the androgen receptor (AR). Testosterone cypionate is converted by the body to testosterone that has both androgenic effects and anabolic effects; [ 4 ] still, the relative potency of these effects can ...
Testosterone undecanoate has a very long elimination half-life and mean residence time when given as a depot intramuscular injection. [27] [7] [8] Its elimination half-life is 20.9 days and its mean residence time is 34.9 days in tea seed oil, while its elimination half-life is 33.9 days and its mean residence time is 36.0 days in castor oil.
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. [2] 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. [2]
Testosterone undecanoate, an ester of testosterone and one of the most widely used androgen esters.. An androgen or anabolic steroid ester is an ester of an androgen/anabolic steroid (AAS) such as the natural testosterone or dihydrotestosterone (DHT) or the synthetic nandrolone (19-nortestosterone).
Whereas the biological half-life of estradiol given by intravenous injection is about 0.5 to 2 hours, the biological half-life of oral estradiol has a range of 13 to 20 hours due to the large and long-lasting pool of estrogen conjugates that is formed during first-pass metabolism and that serves to continuously replenish circulating estradiol ...
[1] [2] It has a relatively short elimination half-life and mean residence time of 2 days and 4 days, respectively. [1] [2] As such, it has a short duration of action and must be administered two to three times per week. [16] Intramuscular injection of testosterone propionate as an oil solution, aqueous suspension, and emulsion has been ...
However, anabolic steroids with a very high ratio of anabolic to androgenic action like nandrolone still have significant androgenic effects and can produce symptoms of masculinization like hirsutism and voice deepening in women and children with extended use.