Anastrozole is an aromatase inhibitor (AI). Anastrozole that works by blocking the aromatase enzyme responsible for estrogen production.
In clinical use, Anastrozole is primarily administered to halt the progression of breast cancer in women.
Some athletes and bodybuilders will also use anastrozole as a part of their steroid cycle to reduce and prevent symptoms of excess estrogens; gynecamastia and water retention.
Dosages of 0.5 mg to 1 mg a day reduce serum estradiol approx. 50% in men