Generic Femara - hormonal remedy, with Letrozole as an active ingredient, which lowers estrogen level in woman after menopause. It slows the growth of certain types of breast tumors that need estrogen to grow in the body. Letrozole is used to treat breast and uterus cancer after menopause It is often given to women who have been taking tamoxifen (Nolvadex, Soltamox) for 5 years.