What are the types of intrauterine devices (IUDs)?
Intrauterine devices (IUDs) come in two different types: • The TCu380A (Paragard) is a copper-containing IUD. It releases copper from a copper wire that is wrapped around the base. The released copper contributes to an inflammatory reaction in the uterus that helps prevent fertilization of the egg. It is approved to remain in place for up to 10 years. • Levonorgestrel-releasing IUD (Mirena): This form of IUD releases a progestin hormone from the vertical part of the T. Progestin acts to thicken cervical mucus, creating a barrier to sperm, as well as renders the lining of the uterus inhospitable to implantation of a pregnancy. This form of IUD is approved for up to five years of use. How does an intrauterine device (IUD) work? It is not fully understood how IUDs work. They are thought to prevent conception by causing a brief localized inflammation that begins about 24 hours after insertion. This causes an inflammatory reaction inside the uterus that attracts white blood cells. The white
