Drospirenone-Estradiol or Ethinyl estradiol is a combination drug that forms a very important part of birth control pills and hormone replacement therapy. It also modifies the cervical and uterine lining, making it difficult for sperm to come in contact with the uterus. This in turn makes it difficult for eggs to fertilize in the uterus. It is also approved by U.S. F.D.A for the treatment of moderate acne and premenstrual dysphoric disorders.
Nuvaring Patches contains Etonogestrel and Ethinyl Estradiol. Etonogestrel and Ethinyl Estradiol both are female hormones. This Ring is available by prescription and prevents the release of an egg from the ovary due to the presence of the two hormones.