Anastrozole tablets for oral administration contain 1 mg of anastrozole, a non-steroidal aromatase inhibitor.Anastrozole is used to treat breast cancer in postmenopausal women. It is often given to women whose cancer has progressed even after taking tamoxifen (Nolvadex, Soltamox). It is a non-steroidal aromatase inhibitor. This medication is available in generic form.