Intrauterine devices (IUDs) are a highly effective and safe method of
contraception that do not require compliance once inserted. The failur
e rates of modern IUDs, such as the Copper T-380, the Multiload copper
375 and the IUD that releases 20 mu g levonorgestrel daily (LNG-IUD-2
0) are less than one pregnancy per 100 woman-years of use, Researchers
have equated these efficacies with those of tubal sterilization and N
orplant implants, IUDs' efficacies are long-lasting, and are easily re
versible. In the present review, I will summarize findings that have b
een reported on issues and new developments concerning IUDs since 1991
, Perspectives are also offered for future studies.