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Intrauterine system (IUS) with progestogen, sold under the brand name Mirena among others, is an intrauterine device that releases the hormone levonorgestrel into the uterus. It is used for birth control, heavy menstrual periods, and to prevent excessive build of the lining of the uterus in those on estrogen replacement therapy. It is one of the most effective forms of birth control with a one-year failure rate around 0.2%. The device is placed in the uterus and lasts three to seven years. Fertility often returns quickly following removal.   Wikipedia

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