Hormonal Methods of Birth Control
Intrauterine devices cannot be used on women who have some uterine abnormalities or conditions. There are other factors that may prevent women from using an IUD such as complications in pregnancy, anemic women, and women who are risk for acquiring a sexually transmitted disease.
Intrauterine devices may cause other complications.
As an emergency contraceptive IUDs are very successful. Using a copper-T (a specific type of IUD) for emergency contraceptive within 5 days after unprotected intercourse is more than 99% effective. This is a better rate of success than the emergency contraceptive pills referred to as 'morning after pills'.