One of the most popular devices is Mirena. It is a T-shaped plastic frame inserted into the uterus to provide long term birth control by releasing the progestin hormone. Mirena is an intrauterine hormonal device (IUD) used to prevent pregnancy for up to 5 years after insertion. It works by thickening the mucus in the cervix and stops the sperm from entering the uterus or fertilizing an egg. Mirena suppresses ovulation by thinning the lining of the uterus.
