Our research study is trying to find out which dose of emergency contraception, sometimes referred to as EC or “the morning-after pill”, works best at preventing pregnancy in women over 176 pounds. We are comparing the standard dose of two types of EC currently on the market with an investigational higher dose of EC. Approximately 1200 women will take part in this study at different research centers across the US. If you join the study, you will be provided with emergency contraception and be followed for about one month.
Our study is testing an investigational vaginal ring that is not yet on the market. The ring is designed to deliver estrogen and a form of progestin called Nestorone. This study will find out how well this product prevents pregnancy and track side effects during ring use. Approximately 370 women will take part in this study at different research centers across the US. If you join the study, you will use the ring for about one year. All study supplies, exams and tests are provided at no cost to you.