Home Feature Do you know what Mirena is?

Do you know what Mirena is?

by sanmigueltimes
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Author: Doctoranytime

You may have heard of Mirena, a hormonal intrauterine device that can provide long-term contraception. The Mirena device is a T-shaped plastic structure that is inserted into the uterus by a specialist, where it can release a type of hormone (progestin). The mechanism of action by which it can prevent pregnancy is mainly:

  • Increase the thickness of the cervical mucus to prevent sperm from reaching or fertilizing an egg.
  • Reduce the thickness of the membrane (endometrium) that lines the uterus on the inside, avoiding the implantation of the embryo and partially inhibits ovulation.

Mirena can prevent pregnancy for up to five years after placement. As Mirena prevents most pregnancies, it is considered a low risk for a woman to have an ectopic pregnancy while she is using the device. Unlike women who do not use contraception.

However, it is important to know the following about Mirena:

● Mirena devices do not protect against STIs.

● Mirena, is a device that releases hormones, has some side effects such as acne,      headache, increased breast sensitivity, etc.

Menstrual bleeding changes in virtually all women. During the first months after insertion, a large number of women have irregular spots. The most noticeable change is the significant decrease in the volume of menstrual bleeding; 20% of women will not have menstrual bleeding of any kind (amenorrhea) after one year of use.

During the first month of use, women using Mirena have had an average of 9 days of spotting. However, the staining gradually decreased and the number of days of staining after 6 months was less than 4, which was comparable to that observed with copper IUDs. The percentage of women with prolonged bleeding (more than 8 days) is reduced from 20% to 3% during the first 3 months of use. The individual response is highly variable.

How to prepare for Mirena?

First of all, it is important to consult a specialist such as a gynecologist to find out if it is

possible for you to use Mirena and what are the steps you should follow to do so. The procedure for inserting the device consists of:

  • Your doctor will evaluate your general health.
  • Your Gynecologist will need to perform a pelvic exam before inserting Mirena.

Later he will place a vaginal mirror and insert the device. In preparation for the insertion of the device, it is advisable to take an anti-inflammatory two hours before the procedure, this will make it less bothersome. You should coordinate with your doctor who will indicate when is the most convenient date to insert the hormonal device In case of removing Mirena you should consult your doctor.

We thank the collaboration of Dr. Alberto Alvarado García, obstetrician-gynecologist who graduated from La Salle University in 1986. He obtained a specialty in Gynecology and Obstetrics from the Mexican Council of Gynecology and Obstetrics in 2000. His specialties are the management of the sterile couple, menopause, diagnosis and treatment of papilloma infections, laparoscopic surgery.


  1. Mirena – Mayo Clinic
  2. Ectopic pregnancy – Mayo Clinic

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