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Is the Mirena IUD Effective?

According to Bayer Healthcare Pharmaceuticals, the Mirena intrauterine device (IUD) is a flexible T-shaped contraceptive device inserted into your uterus to release a progestin hormone (levonorgestrel), which thickens the uterine secretions and lining and prevents fertilization.

  1. Effectiveness

    • The Mirena IUD is 99 percent effective in preventing pregnancy for up to five years, with fewer side effects than most oral contraceptives.

    Maintenance

    • Mirena maintenance includes a pelvic exam four to 12 weeks after insertion and yearly until the Mirena is removed at five years. After each period, you should feel for the threads that hang down into your vagina, ensuring the IUD remains in place.

    Adverse reactions

    • Your periods may be scant, irregular or cease altogether. According to Drugs.com, other side effects include acne, change in libido, hair loss, nausea, vomiting, weight gain, breast tenderness and cramping. You may have a severe allergic reaction.

    Contraindications

    • Women with an unusually-shaped uterus, fibroid uterine tumors, pelvic inflammatory disease, abnormal Pap smear, vaginal/cervical bleeding or inflammation, or breast cancer are not advised to use Mirena.

    Drug interactions

    • St. John's Wort, tetracycline and anti-fungal medications interfere with Mirena's effectivenss. Mirena increases risk of bleeding with blood thinners and decreases effectiveness of lamotrigine, a mood stabilizer.

    Warning

    • If you are diabetic, you must monitor your blood glucose (sugar) levels carefully because Mirena can affect glucose levels.

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