The Letrozole, which has chemical formula C17H11N5, is utilized for the treatment of infertility. There are two reasons in which fertility drugs can be effective. First, it can be utilized for inducing an egg to develop and be released in ladies who are not able to ovulate on their own. It is also effective if uses for the treatment of breast cancer. In addition to this, the Letrozole is soluble in water and has minimal side-effects.