<Tr> <Th> Weight </Th> <Td>... </Td> </Tr> <Tr> <Th> Benefits </Th> <Td>... </Td> </Tr> <P> An intrauterine device (IUD), also known as intrauterine contraceptive device (IUCD or ICD) or coil, is a small, often T - shaped birth control device that is inserted into a woman's uterus to prevent pregnancy . IUDs are one form of long - acting reversible birth control . </P> <P> Among birth control methods, IUDs, along with contraceptive implants, result in the greatest satisfaction among users . Evidence supports effectiveness and safety in adolescents and those who have and have not previously had children . Once removed, even after long - term use, fertility returns to normal rapidly . Failure rates are about 0.8% with copper devices and 0.2% with hormonal (levonorgestrel) devices in the first year of use . </P>

Where are intrauterine devices (iuds) placed in a woman's body