** 1. Letrozole [femara] is an oral anti estrogen drug usually prescribed to post menopausal women with breast cancer and alsso given alongside clomiphene citrate to women having ovulation problems [as in your case] PS. If your cycles doesn t get regular after regular course additional testing such as hysterosalpingogram or laparoscopy may be necessary since in many places it has not gotten approval for this purpose. it s actually an anti-cancer drug, and pregnancies caused by using this drug have sometimes been found to have congenital anomalies 2. although letoval is also an anti cancerous drug but company is promoting it in young women which is not only unethical but also illegal.