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Mirena Side Effects


Many women have reported severe side effects of Mirena — including perforation of the uterus, erosion into the uterine wall, infections, and more. These severe side effects often require surgery, which can be extremely expensive, painful, and debilitating. Bayer is currently facing lawsuits from dozens of women, and the litigation continues to grow as more women file Mirena lawsuits.

Mirena Overview

Mirena is an intrauterine contraceptive device (IUD) invented by Bayer HealthCare Pharmaceuticals, Inc., and approved by the U.S. Food and Drug Administration (FDA) in 2000. The device is meant to be implanted in a woman’s uterus by a trained healthcare professions. It works by slowly releasing levonorgestrel, a hormone found in many birth control pills. It is more than 99.9% effective at preventing pregnancy for up to five years.

Mirena Uterus Perforation

One of the most serious side effects of Mirena is uterus perforation. This complication may occur during insertion of the Mirena, or after insertion, if it erodes into the uterus. Bayer estimates that uterus perforation occurs in about one per 1,000 or 10,000 insertions. Because millions of women have the Mirena, it is likely that there are hundreds, perhaps thousands of cases of uterus perforation.

Once the uterus is perforated, many serious complications can occur. If the threads are lost, surgery may be necessary to remove the Mirena. In some cases, the Mirena has migrated outside the uterus and perforated the intestines, causing life-threatening sepsis. Mirena may not protect against pregnancy once the uterus is perforated, but the resulting pregnancy has a very high risk of complications for both the mother and baby.

Mirena Brain Injury Lawsuits

In early 2014, Bayer was hit with 9 lawsuits accusing them of downplaying risk information about brain injuries from levonorgestrel, the hormone in Mirena. These conditions can elevate cerebrospinal fluid levels, which increases pressure in the skull. Side effects typically include chronic headache, migraines, double-vision, vision problems, and blindness.

Mirena brain injuries include:

Mirena Side Effects

Although Mirena has been linked to severe side effects, many women were unaware of the risks before deciding to get the Mirena IUD. Serious side effects of Mirena may include:

  • Acne
  • Infection
  • Uterus perforation
  • Perforation of the cervix
  • Intestinal obstruction or perforation
  • Abscesses
  • Migration of Mirena into the uterus or outside the uterus
  • Scarring
  • Ectopic pregnancy, which could be life-threatening
  • Miscarriage
  • Infertility
  • Embedment or erosion into the uterus
  • Inflammation of the uterus or abdominal cavity
  • Infection
  • Surgery to remove the Mirena

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