Prescription formulations containing 1 mg of anastrozole are used for the treatment of breast cancer in postmenopausal women. The active ingredient, anastrozole, which reduces estrogen secretion, is contained in 1 mg of each tablet. Anastrozole helps slow or inhibit the growth of estrogen-sensitive breast cancer cells by reducing estrogen levels. Uses The main Uses of 1 mg tablet of anastrozole are: Treatment of postmenopausal women with hormone receptor-positive breast cancer. Adjuvant therapy to reduce the chances of breast cancer recurrence after surgery or other treatments. Prevention of advanced breast cancer in postmenopausal women.