Antiandrogens, also known as androgen antagonists or testosterone blockers, are a class of drugs which 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.

These side effects include breast pain/tenderness and gynecomastia (breast development/enlargement), reduced body hair growth/density, decreased muscle mass and strength, feminine changes in fat mass and distribution, and reduced penile length and testicular size.

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There are a few different major types of antiandrogens.

AR antagonists can be further divided into steroidal antiandrogens and nonsteroidal antiandrogens; androgen synthesis inhibitors can be further divided mostly into CYP17A1 inhibitors and 5α-reductase inhibitors; and antigonadotropins can be further divided into gonadotropin-releasing hormone analogues (Gn RH analogues), progestogens, and estrogens.

and other antiandrogens are not associated with hepatotoxicity.

However, although they do not pose a risk of hepatotoxicity, spironolactone has a risk of hyperkalemia and enzalutamide has a risk of seizures.

Antiandrogens have only limitedly been assessed for this purpose, but the 5α-reductase inhibitors finasteride and dutasteride and the steroidal AR antagonist spironolactone have been associated with significantly reduced risk of prostate cancer.

The 5α-reductase inhibitors finasteride and dutasteride are used to treat benign prostatic hyperplasia, a condition in which the prostate becomes enlarged and this results in urinary obstruction and discomfort.Although the term antiandrogen is generally used to refer specifically to AR antagonists, it may also be used to describe functional antiandrogens like androgen synthesis inhibitors and antigonadotropins, including even estrogens and progestogens.In accordance, therapeutic modalities that reduce androgen signaling in the prostate gland, referred to collectively as androgen deprivation therapy, are able to significantly slow the course of prostate cancer and extend life in men with the disease.In women who are pregnant, antiandrogens can interfere with the androgen-mediated sexual differentiation of the genitalia and brain of male fetuses.This manifests primarily as ambiguous genitalia – that is, undervirilized or feminized genitalia which, anatomically, are a cross between a penis and a vagina – and theoretically also as femininity and homosexuality.Side effects of antiandrogens depend on the type of antiandrogen and the specific antiandrogen in question.