The Mirena IUD is an intrauterine device designed to prevent pregnancy in women seeking a long-term method of birth control. After Mirena is inserted, the implant releases a low-dose of levonorgestrel, a synthetic progestin into the uterus. The IUD may stay in place for up to five years.
The Mirena IUD has been on the market since 2000 after it was approved by the U.S. Food and Drug Administration (FDA) as a contraceptive. In 2009, its range of uses expanded to treat heavy menstrual bleeding.