Fadrozole is primarily used in the treatment of hormone-dependent breast cancer in postmenopausal women. It works by inhibiting the enzyme aromatase, which is responsible for converting androgens into estrogens. By reducing estrogen levels, it helps slow down or stop the growth of certain types of breast tumors that require estrogen to grow. Additionally, it is sometimes used in veterinary medicine to manage estrogen-dependent conditions in animals. Fadrozole is also utilized in research settings to study the role of estrogen in various physiological and pathological processes. Its ability to selectively inhibit aromatase makes it a valuable tool in both clinical and experimental contexts.