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Mirena® is a tiny T-shaped piece of plastic that is placed into the uterus by your healthcare professional. Once Mirena® is in place, it begins to slowly release small amounts of the hormone levonorgestrel into your uterus. It does not contain estrogen, so you can be free of estrogen-related side effects.
While there is no single explanation for how Mirena® works, it may:
It is believed that all 3 of these actions may work together to prevent pregnancy.
It is thought that the small amounts of levonorgestrel that are released by Mirena® make your cervical mucus thick and tacky. This is why sperms are immobilized and can't enter the uterus. And the thinning of the uterus is why you may have less menstrual bleeding over time. In fact, about 20% of women will have no period after one year, a safe (and, for most women, preferred) condition.
Mirena® is made of soft, flexible plastic. It's so small and comfortable, most likely you and your partner will never know it's there.
IMPORTANT INFORMATION ABOUT MIRENA®:
Only you and your healthcare professional can decide if Mirena is right for you. Mirena does not protect against HIV or sexually transmitted diseases (STDs). Candidates for Mirena have had a child. Mirena is not appropriate for women who are or may be pregnant; or who may have a distorted uterine cavity; acute genital infections including pelvic inflammatory disease; cancer of the cervix, uterus, or breasts; unexplained vaginal bleeding; or acute liver disease or tumors (benign or malignant). In rare cases, perforation or embedment may occur. Mirena may become completely or partially dislodged. In the rare event you think you're pregnant, contact your healthcare professional without delay to be evaluated for ectopic pregnancy. Ovarian cysts may occur and typically disappear. Persistent cysts should be evaluated. Missing periods or irregular bleeding is common in the first few months, followed by shorter, lighter periods.
You are encouraged to report negative side effects of prescription drugs to the FDA.
Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.
