Mirena is a long-acting, reversible intrauterine system (IUS) that provides highly effective birth control for up to 8 years. It is a small, T-shaped device that releases a low dose of levonorgestrel, a progestin hormone, directly into the uterus. This local hormone delivery helps prevent pregnancy by thickening cervical mucus, inhibiting sperm movement, and reducing the likelihood of fertilization, while also thinning the uterine lining.

Because Mirena delivers hormones primarily within the uterus, overall systemic hormone exposure remains low. Many users experience lighter menstrual periods, and Mirena is also approved for treating heavy menstrual bleeding in individuals choosing an IUD for birth control. Fertility typically returns quickly upon removal.

Key Features

• Up to 8 years of continuous pregnancy prevention

• Contains levonorgestrel (52 mg total), released gradually for consistent effectiveness

• Can improve heavy and painful periods over time

• Suitable for users seeking a low-maintenance birth control option

• Immediate return of fertility after removal

• Must be inserted and removed by a trained healthcare provider

Possible Side Effects / Considerations

• Irregular bleeding and spotting in the first 3–6 months are common

• Possible cramping or discomfort after insertion

• Small risk of expulsion or uterine perforation

• Not recommended for individuals with certain uterine abnormalities or active pelvic infection