Effects of Mirena

Mirena® is a type of birth control known as an intrauterine system (IUS). It is inserted into the uterus by a healthcare provider, where it can remain for up to five years. This product is only approved for women who have had at least one child, or for those who wish to use it to prevent heavy menstrual bleeding.
Mirena has several different effects on the body: It prevents ovulation and also affects certain changes in the cervical mucus and uterus that make it more difficult for conception to occur.
Mirena is highly effective at preventing pregnancy. Only 0.1 percent of women will become pregnant while using it, which is at least as effective as the birth control pill and much more effective than most other forms of birth control.
Keep in mind that this is not a permanent form of contraception. It cannot be used for more than five years, and after it is removed, 80 percent of women may become pregnant within one year.
(To learn more about how to ensure the effectiveness of this product, click Mirena. This article also covers possible side effects to be aware of and what to tell your healthcare provider before using it.)
Last reviewed by: Kristi Monson, PharmD
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