What is an aromatase inhibitor?
An aromatase inhibitor is a drug that blocks aromatase, an enzyme needed to make estrogen. Before menopause, your ovaries make most of your estrogen. After menopause, you can still have estrogen in your body, because the enzyme aromatase converts hormones called androgens into estrogen. Aromatase inhibitors like ARIMIDEX work by lowering the amount of estrogen in your body after menopause.
