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Risks. Less than 1 percent of women who use ParaGard will get pregnant in the first year of typical use. If you do conceive while using ParaGard, you're at higher risk of an ectopic pregnancy â when the fertilized egg implants outside the uterus, usually in a fallopian tube.
ParaGard produces an inflammatory reaction in the uterus that is toxic to sperm, which helps prevent fertilization. ParaGard is the only copper IUD available in the U.S. ParaGard prevents pregnancy for up to 10 years after insertion. ParaGard is an intrauterine device (IUD) that's inserted into the uterus for long-term contraception. ParaGard prevents sperm from entering the fallopian tubes.