![]() That means the LNG-IUD will prevent pregnancy in 998 of 1,000 women. ![]() Hormonal levonorgestrel-releasing IUD (LNG-IUD): Less than 1 pregnancy per 100 women using the LNG-IUD over the first year (2 per 1,000 women). In fact, they are among the most effective reversible methods, with pregnancy rates similar to those for female sterilization. Some women do not want to use the IUD because they incorrectly believe that the IUD is not effective in preventing pregnancy or that the IUD loses its contraceptive effect after only a few years from the time of insertion.įact: IUDs are the more than 99% effective!īoth the hormonal and copper-bearing IUDs are highly effective contraceptive methods. ![]() In very rare case, IUDs prevent implantation which is considered a contraceptive not an abortifacient effect. Thus, the current evidence suggests that the main mechanisms of action of IUDs occur prior to fertilization. IUDs that contain progestin cause the cervical mucus to thicken, which stops sperm from entering the uterus. The copper-bearing IUD acts as a spermicide, killing or impairing sperm so they cannot reach the egg. In the vast majority of cases, IUDs work by preventing fertilization. Some couples do not want to use the IUD because they incorrectly believe that the IUD prevents pregnancy by causing abortions.įact: IUDs do not work by causing abortions This page was originally published in 2012 and has since been updated. ![]()
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