Contraceptive Vaginal RingMADDEN, TESSA MD, MPH*; BLUMENTHAL, PAUL MD, MPH†Clinical Obstetrics & Gynecology: December 2007 - Volume 50 - Issue 4 - pp 878-885 doi: 10.1097/GRF.0b013e318159c07e Hormonal Contraception Abstract Author Information The vaginal contraceptive ring is comprised of ethinyl vinyl acetate that releases ethinyl estradiol and the third-generation progestin, etonorgestrel. It was approved by the Food and Drug Administration in 2001. The vaginal contraceptive ring is highly efficacious with a Pearl Index of 1.18 and an efficacy of 99.1%. Effectiveness is similar with actual use. *Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri †Department of Obstetrics and Gynecology, Stanford University, Stanford, California Correspondence: Tessa Madden, MD, MPH, Department of Obstetrics and Gynecology, Washington University School of Medicine, 4533 Clayton Ave, Box 8219, St. Louis, MO 63110. E-mail: firstname.lastname@example.org © 2007 by Lippincott Williams & Wilkins.