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Conjugated estrogens (CEs), or conjugated equine estrogens (CEEs), sold under the brand name Premarin among others, is an estrogen medication which is used in menopausal hormone therapy and for various other indications.
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Tritiated estradiol radioactivity in blood with a single intramuscular injection of 1.5 to 2.8 μg tritiated estradiol in aqueous solution in four women. [1] Peak blood radioactivity occurred within 15 minutes in three of the women and in the remaining woman after 2 hours. [1] Source: Davis et al. (1963). [1]
Estrone is an estrogen, specifically an agonist of the estrogen receptors (ERs) ERα and ERβ. [5] [44] It is a far less potent estrogen than is estradiol, and as such is a relatively weak estrogen. [5] [44] Given by subcutaneous injection in mice, estradiol is about 10-fold more potent than estrone and about 100-fold more potent than estriol. [45]
Conjugated estrogens/medroxyprogesterone acetate (CEs/MPA), sold under the brand names Prempro and Premphase, is a combination product of conjugated equine estrogens (Premarin), an estrogen collected from horse urine, and medroxyprogesterone acetate (Provera), a progestogen, which is used in menopausal hormone therapy for the treatment of menopausal symptoms.
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.
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).
An example pseudopregnancy regimen in women which has been used in clinical studies is intramuscular injections of 40 mg/week estradiol valerate and 250 mg/week hydroxyprogesterone caproate. [3] It has been found to result in estradiol levels of about 3,100 pg/mL at 3 months of therapy and 2,500 pg/mL at 6 months of therapy. [3]