A drug that lowers the amount of estrogen made in the body after menopause. This can slow or stop the growth of cancer that needs estrogen to grow. It belongs to the group of drugs called aromatase inhibitors. Other aromatase inhibitors include Arimidex (chemical name: anastrozole) and Aromasin (chemical name: exemestane).
Read more about Femara (chemical name: letrozole).
Audio contributed by: Katie Couric