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Mirena is a hormonal intrauterine device (IUD) that's inserted into the uterus for long-term birth control (contraception). A T-shaped plastic frame that releases a type of progestin, Mirena thickens the cervical mucus to prevent sperm from reaching or fertilizing an egg. Mirena also thins the lining of the uterus and partially suppresses ovulation.

Mirena is the only hormonal IUD that has Food and Drug Administration (FDA) approval. Mirena prevents pregnancy for up to five years after insertion.

Jan. 21, 2012