Back to Your contraception guide. An IUS is a small, T-shaped plastic device that's put into your womb uterus by a doctor or nurse. It thickens the cervical mucus, which makes it more difficult for sperm to move through the cervix, and thins the lining of the womb so an egg is less likely to be able to implant itself. For some women, it can also prevent the release of an egg each month ovulation , but most women continue to ovulate.
Generic Name: levonorgestrel Intrauterine route. Medically reviewed by Drugs. Last updated on Dec 29, Levonorgestrel-releasing intrauterine system is a device that contains the female hormone, levonorgestrel.
Every form of hormonal birth control has its own benefits and side effects. The Mirena IUD is no exception. Most side effects taper off over time as your body adjusts. Some people claim that Mirena causes weight gain , but the evidence for this is sparse.