what is mirena?
Mirena is a long-acting, reversible birth control implant called a hormonal intrauterine device (IUD) manufactured by Bayer Pharmaceuticals. An IUD is a small, flexible, T-shaped device that doctors implant in the uterus. Mirena uses levonorgestrel â a progestin birth control hormone â to prevent pregnancy. It releases a small amount of hormones into the uterus over time.