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Antiandrogens, also known as androgen antagonist or testosterone blockers, are hormone antagonist compounds capable of preventing or inhibiting the biologic effects of androgens on normally responsive tissues in the body (see androgen insensitivity syndrome).

How they work

Antiandrogens work in several different ways: some prevent androgens from binding to the appropriate receptors, others interfere with the production of testosterone, others prevent testosterone from metabolizing into the more potent dihydrotestosterone (DHT), while still others suppress the production of hormones that trigger testosterone production. Many antiandrogens, including spironolactone, finasteride, and androcur use several of these techniques at the same time.


Antiandrogens are often indicated to treat severe male sexual disorders, such as hypersexuality and sexual deviation, specifically paraphilias, as well as use as an anti-tumour antibiotic and palliative, adjuvant or neoadjuvant hormonal therapy in prostate cancer.

Antiandrogens can also be used for treatment of benign prostatic hyperplasia (prostate enlargement), acne, androgenetic alopecia (male pattern baldness), and hirsutism (excessive hairiness). They are also occasionally used as a male contraceptive agent, to purposefully prevent or counteract masculinisation in the case of transwomen undergoing gender reassignment therapy, and to prevent the symptoms associated with reduced testosterone, such as hot flashes, following castration.

The administration of antiandrogens in males can result in slowed or halted development or reversal of male secondary sex characteristics, reduced activity or function of the accessory male sex organs, and hyposexuality (diminished sexual desire or libido).

The term antiandrogen withdrawal response (AAWR) describes the medical course taken when cancer cells adapt to feed on the antiandrogens rather than androgen, so that treatment must be halted in order to starve those cells thriving on the antiandrogens.

Antiandrogen drugs

Currently available antiandrogen drugs (brand names in parentheses) include:

  • Spironolactone (Aldactone, Spiritone), a synthetic 17-spirolactone corticosteroid, which is a renal competitive aldosterone antagonist in a class of pharmaceuticals called potassium-sparing diuretics, used primarily to treat low-renin hypertension, hypokalemia, and Conn’s syndrome.
  • Cyproterone acetate (Androcur, Climen, Diane 35, Ginette 35), a synthetic steroid, a potent antiandrogen that also possesses progestational properties.
  • Flutamide (Eulexin), nilutamide (Anandron, Nilandron) and bicalutamide (Casodex), nonsteroidal, pure antiandrogens. Flutamide is the oldest and has more unwanted side effects than the others. Bicalutamide is the newest and has the least side effects.
  • Ketoconazole (Nizoral), an imidazole derivative used as a broad-spectrum antifungal agent effective against a variety of fungal infections, side effects include serious liver damage and reduced levels of androgen from both the testicles and adrenal glands. Ketoconazole is a relatively weak antiandrogen.
  • Finasteride (Proscar, Propecia) and dutasteride (Avodart), inhibitors of the 5-α-reductase enzyme that prevent the conversion of testosterone into dihydrotestosterone (DHT). Finasteride blocks only 5-α-reductase type II, dutasteride also blocks type I. They are not general antiandrogens in that they don’t counteract the effects or production of other androgens than DHT.

This article appears to be forked from Wikipedia’s article on Antiandrogens by Jennifer Kirk