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A small T-shaped frame containing levonorgestrel, a progestin hormone. Once placed in the uterus by a healthcare provider, the IUS slowly releases the hormone, which thins the lining of the uterus and thickens the cervical mucus, preventing passage of sperm through the cervical canal. An IUS is replaced either every 3 or every 5 years depending on the product.
The intrauterine system (IUS) and intrauterine device (IUD) are about the size of a quarter. IUCs are generally small T-shaped frames that are a little longer than an inch (about 3 cm) – or about the size of a quarter, with a lot less surface area!
99.8% effective with perfect use
99.8% effective with typical use
Replace every 3 or 5 years
May be associated with decreased menstrual pain
May reduce menstrual flow; some women may stop having periods