What Are the Bad Side Effects of Mirena?

Reviewed on 2/26/2021

Side effects of Mirena

A National Center for Health Statistics study found that most women who use birth control chose intrauterine devices (IUDs).
Most women who use birth control chose intrauterine devices (IUDs).

A National Center for Health Statistics study found that most women who use birth control chose intrauterine devices (IUDs). The Mirena IUD is one device that has become increasingly popular. However, before choosing an IUD, patients should talk to their doctors about the potential for life-threatening side effects. The common side effects of Mirena are:

Serious side effects:

Mirena IUD can get expelled from the uterus, which increases the risk of pregnancy. This may happen to any women; however, a few females are at a higher risk:

  • Women who have previously expelled an IUD
  • Females who are younger than 20 years
  • Women who have prolonged or heavy period
  • Women who have never been pregnant

Pseudotumor cerebri: One of the lesser known but serious side effects of the Mirena IUD is pseudotumor cerebri or PTC. Pseudotumor cerebri, also known as intracranial hypertension, occurs when the pressure inside the skull increases for no obvious reason. Some of the symptoms of pseudotumor cerebri include:

Risk of ectopic pregnancy: One of the reported side effects of Mirena is the risk of an ectopic pregnancy. This occurs when a fertilized egg implants in an area other than the uterine wall, such as the fallopian tubes, abdomen, cervix, or ovary. Common symptoms are:

Pelvic inflammatory disease (PID): Another serious side effect that can occur with the use of Mirena is pelvic inflammatory disease (PID). If PID occurs because of Mirena, it typically develops within the first 20 days of insertion. PID is a bacterial infection that affects the reproductive organs, such as the uterus. If not treated promptly, women who contract PID may suffer from infertility. With a severe case of PID, a patient may require surgery and may be at risk of death. Patients who have received the Mirena IUD should be observant for potential signs of a complication, which may include:

Mirena crash: Mirena IUD releases a synthetic hormone (levonorgestrel) when it is in place. After the IUD is removed, it forces the body to begin production of the hormone progesterone again. However, it could take some time for the body to respond and begin producing adequate levels of progesterone. The sudden changes in hormones could be a factor in causing symptoms related to the Mirena crash. Common symptoms of the Mirena crash are:

Other reported side effects of Mirena IUD are:

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WebMD. Mirena 20 Mcg/24 Hours (6 Yrs) 52 Mg Intrauterine Device Contraceptives Side Effects by Likelihood and Severity. https://www.webmd.com/drugs/2/drug-20420/mirena-intrauterine/details/list-sideeffects

Bayer HealthCare Pharmaceuticals Inc. Mirena®. July 2018. https://www.accessdata.fda.gov/drugsatfda_docs/label/2008/021225s019lbl.pdf

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