Anastrozole is a medication primarily used to treat certain types of breast cancer in postmenopausal women. It works by inhibiting the enzyme aromatase, which is responsible for converting androgens into estrogens. By lowering estrogen levels, Anastrozole helps slow or stop the growth of hormone-sensitive tumors. This drug is often prescribed after surgery or radiation therapy to reduce the risk of cancer recurrence. Common side effects may include hot flashes, joint pain, and fatigue. Anastrozole is typically taken as a daily oral tablet, and its effectiveness is monitored by healthcare providers throughout treatment.