Mirena is one of two intrauterine device (IUD) methods used to prevent pregnancy. The shape of the device and the hormones it releases are what make it a unique and effective birth control choice.
Significance
Mirena is a T-shaped plastic device that has a thread attached. It must be placed into the uterus, hence the term intrauterine device, by a medical professional. It can remain in place for up to five years, according to the Mayo Clinic. A medical professional can remove the device by pulling on the attached thread.
Function
Mirena contains levonorgestrel. According to Mayo Clinic, this hormone inhibits sperm motility and thins the uterine lining, making it unsuitable for pregnancy. The shape of Mirena also prevents sperm from making their way through the fallopian tubes to fertilize an egg, according to Mirena.com.
Effectiveness
According to both Mayo Clinic and Mirena.com, this IUD is 99.9 percent effective in preventing pregnancy. It must be replaced every five years to maintain effectiveness.
Side Effects
Mirena has the risk of side effects. Some positive effects may be lighter periods and cramping, according to the Mayo Clinic. There is also the chance of break through bleeding, according to Mirena.com. Other serious side effects are rare but include the displacement of the device causing uterine infection or damage.
Is Mirena For You?
As of 2009 Mirena's price was between $300 and 500 for a device that last five years, according to the Mayo Clinic. This does not include the cost of insertion. Note: some insurance plans do not cover the cost of the device or the office visit charges associated with it. Mirena manufacturers recommend using the IUD after you have given birth to a child.
