Mirena

Generic name:levonorgestrel intrauterine system [ LEE-voe-nor-JES-trel-IN-tra-UE-ter-ine-SIS-tem ]
Drug classes:Contraceptives, Progestins

Medically reviewed by Sophia Entringer, PharmD. Last updated on Aug 24, 2021.

What is Mirena?

The Mirena intrauterine device (IUD) contains levonorgestrel, a female hormone that can cause changes in your cervix and uterus. Mirena is a T-shaped plastic intrauterine device that is placed in the uterus where it slowly releases the hormone.

Mirena IUD is used to prevent pregnancy for 7 years. You may use this IUD whether you have children or not. Mirena is also used for up to 5 years to treat heavy menstrual bleeding in women who choose to use an intrauterine form of birth control.

Levonorgestrel is a progestin hormone and does not contain estrogen. The Mirena IUD releases levonorgestrel in the uterus, but only small amounts of the hormone reach the bloodstream.

Mirena should not be used as emergency birth control.

Warnings

Do not use Mirena during pregnancy. Tell your doctor right away if you become pregnant.

You should not use Mirena if you have abnormal vaginal bleeding, a pelvic infection, certain other problems with your uterus or cervix, or if you have breast or uterine cancer, liver disease or liver tumor, or a weak immune system.

Before taking this medicine

The Mirena IUD can increase your risk of developing a serious pelvic infection, which may threaten your life or your future ability to have children. Ask your doctor about this risk.

Do not use Mirena during pregnancy. If left in place during pregnancy, this IUD could cause severe infection, m...