This product is a small, flexible device that is placed in the womb (uterus) to prevent pregnancy. It is used by women who want to use a reversible birth control method that works for a long time (up to 5 years). It is also used to treat heavy menstrual bleeding in women who choose to use this birth control method. The device slowly releases a hormone (levonorgestrel) that is similar to a hormone that women normally make. This device helps prevent pregnancy by making cervical fluid thicker, interfering with sperm movement, and reducing sperm survival to prevent sperm from reaching an egg (fertilization). It also changes the lining of the uterus (womb) to prevent attachment of a fertilized egg. If a fertilized egg does not attach to the uterus, it passes out of the body. This device may also stop the release of an egg from your ovary (ovulation), but this is not the way it works in most women.
Pain, bleeding, or dizziness during and after placement of the device may occur. Cramps, irregular menstrual periods, and vaginal bleeding between periods (spotting) may occur, especially during the first few weeks of use. Headache, nausea, breast tenderness, or weight gain may also occur. If any of these effects persist or worsen, tell your doctor promptly.