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With estradiol valerate, it is reported that a dose of 5 mg has a duration of 7 to 8 days, [274] 10 mg a duration of 10 to 14 days, [265] [282] 40 mg a duration of 2 to 3 weeks, and 100 mg a duration of 3 to 4 weeks. [282] High doses of estradiol valerate, such as 40 mg per week, can achieve pregnancy levels of estradiol. [283]
The elimination half-life of estradiol valerate in oil by intramuscular injection (brand names Estradiol-Depot 10 mg, Progynon Depot-10) is about 3.5 days, with a range of 1.2 days to 7.2 days in different individuals. [9]
Estradiol (E2) is a medication and naturally occurring steroid hormone. [11] [12] [13] It is an estrogen and is used mainly in menopausal hormone therapy and to treat low sex hormone levels in women.
Compared to conventional estradiol esters, polyestradiol phosphate has an extremely long duration; its elimination half-life is approximately 70 days. [24] Whereas conventional estradiol esters form a long-lasting depot in muscle and fat at the site of injection, [1] this is not the case with polyestradiol phosphate. [25]
Estradiol is an estrogen, or an agonist of the nuclear estrogen receptors (ERs), the estrogen receptor alpha (ERα) and the estrogen receptor beta (ERβ). [1] [2] [6] In one study, the EC 50 Tooltip half-maximal effective concentration value of estradiol for the human ERα was 50 pM (0.05 nM) and for the human ERβ was 200 pM (0.2 nM).
Trough estradiol levels and MADRS Tooltip Montgomery–Åsberg Depression Rating Scale scores with 1 mg sublingual micronized estradiol 3 to 8 times per day (3 to 8 mg/day total; mean 4.8 mg/day total) in women with postpartum depression. [8] Blood was drawn specifically in the mornings before the first dose of sublingual estradiol for the day. [8]
Mean estradiol levels during 1 to 8 mg/day oral estradiol therapy alone or in combination with 100 to 200 mg/day spironolactone in transgender women. [ 3 ] Percent change in estradiol (E2), estrone (E1), LH, and FSH levels over a 24-hour period following a single dose of 2 mg oral estradiol in women.
[2] [3] In demonstration of the importance of first-pass metabolism and the estrogen conjugate reservoir in the pharmacokinetics of estradiol, [2] the terminal half-life of oral estradiol is 13 to 20 hours [4] whereas with intravenous injection its terminal half-life is only about 1 to 2 hours.
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