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4) The introduction of a foreign body in the uterus provokes the release of substances that threaten to both the man's sperm and the woman's egg. These substances, prostaglandin and leukocytes, are produces by the endometrium. Leukocytes are better known as white blood cells that attack foreign materials in the body. With the presence of the Mirena IUD, these materials include both the sperm and the egg. Protaglandins have a variety of purposes, hormone regulation among these uses.

The Mirena IUD is not right for everyone. The Mirena intrauterine device should not be used by women who have structural or fibroid problems with their uterus, have a genital tract cancer, experience abnormal vaginal bleeding, have postpartum infection or any infection related to an abortion or miscarriage, have or at risk to acquire an STD, have a PID, or have an inflamed cervix that bleeds easily or discharges mucus.

Although risks of side effects associated with the Mirena IUD are relatively low, there are chances of complications.

Most complications occur during the first few weeks after insertion. These can include pelvic inflammatory disease. Pelvic inflammatory disease, also referred to as (PID) is an infection causing inflammation of the uterus, ovaries, and fallopian tubes.

Some women using Mirena develop ovarian cysts. These are generally harmless and go away on their own.

There is also a risk during insertion that the uterus is perforated or torn. This is very rate but could cause bleeding and possibly surgery.

In comparison to birth control pills, visiting your gynecologist for the insertion of the Mirena IUD is relatively inexpensive. Many insurance carriers require a deductible of around $500. Although this may sound like Mirena costs more than regular birth control pills, when compared to the costs of birth control pills over five years (the length of time for which Mirena is effective) the costs are considerable less.