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Antiandrogens, also known as androgen antagonists or testosterone blockers, are a class of drugs that prevent androgens like testosterone and dihydrotestosterone (DHT) from mediating their biological effects in the body. They act by blocking the androgen receptor (AR) and/or inhibiting or suppressing androgen production.
This is a list of antiandrogens, [1] or drugs that prevent the effects of androgens like testosterone and dihydrotestosterone (DHT). [2] It includes direct antagonists of the androgen receptor (AR), androgen synthesis inhibitors like 5α-reductase inhibitors and CYP17A1 inhibitors , and antigonadotropins like GnRH analogues , estrogens , and ...
Antiestrogens, also known as estrogen antagonists or estrogen blockers, are a class of drugs which prevent estrogens like estradiol from mediating their biological effects in the body. They act by blocking the estrogen receptor (ER) and/or inhibiting or suppressing estrogen production .
Testosterone levels with 100 to 300 mg/day oral cyproterone acetate and low-dose oral estrogen in men. [160] The estrogen used was 0.1 mg/day diethylstilbestrol (DES), [160] which has been described as an "extremely low" dosage. [87] Levels of testosterone were decreased by about 95% with the combination and by about 61% with cyproterone ...
Estrogen is the predominant sex hormone that slows bone loss (even in men). Both estrogen and testosterone help stimulate bone formation (T, especially at puberty). Testosterone may cause an increase in cortical bone thickness in transgender men (however this does not necessarily translate to a greater mechanical stability).
Relative to testosterone, DHT is considerably more potent as an agonist of the androgen receptor (AR). In addition to its role as a natural hormone, DHT has been used as a medication, for instance in the treatment of low testosterone levels in men; for information on DHT as a medication, see the androstanolone article.
Unlike the GnRH agonists, which cause an initial stimulation of the hypothalamic–pituitary–gonadal axis (HPG axis) that leads to a surge in testosterone or estrogen levels, GnRH antagonists have an immediate onset of action and rapidly reduce sex hormone levels without an initial surge. [1] [25
[85] [62] However, in contrast, the effects of the elevated estrogen levels remain unopposed by bicalutamide, and this is importantly involved in the feminizing side effects (e.g., gynecomastia) of the drug in men. [106] Testosterone levels decline with age in men and younger men have higher testosterone levels on average than older men. [107]
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