Progestasert and LNG-20 are two types of intrauterine devices (IUDs) that are available to help women achieve contraception. Progestasert is a copper-releasing device that uses copper to prevent pregnancy. The copper released by the device acts as a contraceptive by preventing sperm from fertilizing the egg. Copper has been used as a non-hormonal contraceptive for more than 40 years and is considered to be a safe and reliable form of birth control. Progestasert is an effective form of contraception with a success rate of more than 99%. When Progestasert is used correctly and consistently, it will protect a woman from becoming pregnant for up to five years. LNG-20 is a progestin-releasing IUD that contains a type of the hormone progestin (levonorgestrel). Progestin works by thickening the cervical mucus, making it harder for sperm to pass through and reach the egg. It also thins the lining of the uterus to prevent a fertilized egg from attaching to it, and it can also prevent ovulation in some cases. LNG-20 is an effective form of contraception with a success rate of more than 99%, and when used correctly and consistently it will protect a woman from becoming pregnant for up to three years. Both Progestasert and LNG-20 are low maintenance forms of contraception and are considered to be safe and reliable. While side-effects can occur with the use of any IUD, they can be managed and should not prevent a woman from using the device. Both Progestasert and LNG-20 are effective forms of contraception that can help women to prevent pregnancy when used correctly and consistently.