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The Curious Bag
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Mirena is the trade name for an intrauterine device (IUD) designed to prevent pregnancy. It must be inserted by a doctor. Once inside the uterus it can stay in place for up to five years.
How it Works
Mirena prevents pregnancy in three ways: it delivers the hormone progestin to the body, thinning the lining of the uterus and reducing sperm motility; its T-shape obstructs sperm's journey on the path to the fallopian tubes; and it prevents an embryo from attaching to the uterus if fertilization does occur, according to the Mayo Clinic.
Effectiveness
According to Mirena-US.com, Mirena keeps hormone levels steadier and lower than the birth control pill and is more than 99 percent effective at preventing pregnancy.
Side Effects
Side effects of using Mirena are light unpredictable periods, lack of periods or cramping and discomfort after insertion. In rare cases, a pelvic infection may occur in the weeks after insertion.
Maintenance
Mirena users must feel for the threads of the IUD monthly to ensure the device hasn't been expelled. It must be replaced every five years.
Removal
Mirena can be removed by a doctor. Most women will resume normal fertility quickly, according to the Mayo Clinic.
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