Letroz tablets contain Letrozole 2.5 mg which is used in the treatment of breast cancer and infertility due to anovulation. Letroz Tablet is an aromatase inhibitor. It works by decreasing the amount of oestrogen (natural female hormone) produced in the body. This can slow or stop the growth of some breast cancers that need oestrogen to grow. In addition it is also useful in infertility whereby it increases the release of certain hormones to stimulate the release of eggs from the ovaries.