What Is an IUD?
An IUD (intrauterine device) is a small, flexible, T-shaped plastic device that's inserted directly into your uterus to prevent pregnancy. There are five different brands of IUDs: the nonhormonal copper IUD, Paragard, and a few different hormonal versions, including Mirena, Skyla, Kyleena, and Liletta, which release the hormone progestin to prevent pregnancy. Paragard lasts up to 12 years, while the hormonal versions are effective for anywhere from three to seven years.
The side effects you can experience with an IUD depend on which type you choose.