This medication is a combination of 2 hormones: an estrogen (ethinyl estradiol) and a progestin (drospirenone). This product is used to prevent pregnancy. It works mainly by preventing the release of an egg (ovulation) during your menstrual cycle. It also makes vaginal fluid thicker to help prevent sperm from reaching an egg (fertilization) and changes the lining of the uterus (womb) to prevent attachment of a fertilized egg. If a fertilized egg does not attach to the uterus it passes out of the body. This medication also may be used to treat premenstrual dysphoric disorder (PMDD) or moderate acne if you have chosen to use birth control pills as your method of pregnancy prevention. Besides preventing pregnancy birth control pills may make your periods more regular decrease blood loss and painful periods and decrease your risk of ovarian cysts.