Side Effects of Mirena After Insertion

Mirena is a type of birth control in which a T-shaped plastic frame called an intrauterine device is inserted into the uterine cavity via the vagina. The frame releases levonorgestrel to the uterus wall, preventing pregnancy. Mirena can last up to five years, but it can be removed at any time. It is as effective as tubal ligation at preventing pregnancy.

Missed Periods

• About 20 percent of women who use Mirena stop having their periods about a year after insertion. After Mirena is removed, women will begin experiencing their period regularly again.

Menstruation Changes

• In the first six months after Mirena is inserted, some women experience spotting between periods. Additionally, some Mirena users have heavier-than-normal periods soon after insertion, but bleeding eventually becomes lighter than usual in many cases.

Ovarian Cyst

• About 12 percent of Mirena users develop ovarian cysts, but they usually disappear with no medical intervention within a few months.

Expulsion

• In rare cases, Mirena may come out on its own. If this happens, you can become pregnant.

Discomfort

• A relatively common side effect is experiencing some discomfort when Mirena is inserted. Complaints include bleeding or cramping and dizziness.