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Cypionic acid is used to prepare ester prodrugs which have increased half-lives relative to the parent compound. The lipophilicity of the cypionate group allows the prodrug to be sequestered in fat depots after intramuscular injection. [2] The ester group is slowly hydrolyzed by metabolic enzymes, releasing steady doses of the active ingredient.
[4] [3] As such, testosterone cypionate and testosterone enanthate are considered to be "functionally interchangeable" as medications. [4] For reference, testosterone enanthate has an elimination half-life of 4.5 days and a mean residence time of 8.5 days and requires frequent administration of approximately once per week. [21]
The absorption half-life of subdermal testosterone implants is 2.5 months. [8] The replacement interval is once every four to six months. [41] [87] A single 50 mg testosterone pellet implanted every 4 to 6 months has been found to result in testosterone levels of 70 to 90 ng/dL in women. [41]
In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.
Mercury (as methylmercury) in the body has a half-life of about 65 days. Lead in the blood has a half life of 28–36 days. [29] [30] Lead in bone has a biological half-life of about ten years. Cadmium in bone has a biological half-life of about 30 years. Plutonium in bone has a biological half-life of about 100 years.
Estradiol cypionate is a synthetic estrane steroid and the C17β cyclopentylpropionate (cypionate) fatty acid ester of estradiol. [ 59 ] [ 22 ] It is also known as estra-1,3,5(10)-triene-3,17β-diol 17β-cyclopentylpropionate.
The different testosterone esters provide for different elimination half-lives in the body. Esterification of testosterone provides for a sustained but non-linear release of testosterone hormone from the injection depot into the circulation. Sustanon 100 is administered once every 2 weeks and Sustanon 250 is administered once every 3 to 4 weeks ...
Estradiol cypionate/testosterone cypionate (EC/TC), sold under the brand names Depo-Testadiol and Femovirin among others, is an injectable combination medication of estradiol cypionate (EC), an estrogen, and testosterone cypionate (TC), an androgen/anabolic steroid, which is used in menopausal hormone therapy for women. [1]