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Mirena is a hormone-releasing IUD that prevents pregnancy for up to 8 years and treats heavy periods for up to 5 years. Learn about Mirena 's effectiveness, safety, cost, and how to get it from your healthcare provider. Mirena (levonorgestrel-releasing intrauterine device) is used for birth control. Learn side effects, dosage, drug interactions, warnings, patient labeling, reviews, and more. Find patient medical information for Mirena (levonorgestrel) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Mirena (levonorgestrel) is a prescription intrauterine device (IUD). It’s used to help prevent pregnancy and treat heavy periods in people who chose to use an IUD as a birth control device.