Anastrozole belongs in the class of doses called aromatase inhibitors. It inhibits a enzyme aromatase, which is responsible for converting androgens (produced by women in the adrenal glands) to oestrogen.

A ATAC (Arimidex, Tamoxifen, Alone or around Combination) test is an extended-long-run watch-higher learn of 9366 women sustaining localized breast cancer who received either anastrozole or/and tamoxifen. When additional than Quint years a class action that received anastrozole got significantly better clinical effects than a estrogen antagonist class action. A test suggested that anastrozole is the favorite medical therapy for postmenopausal women by owning localized breast cancer that is estrogen receptor positive.