The ParaGard device is a T-shaped plastic frame that's inserted into the uterus. Copper wire coiled around the device produces an inflammatory reaction that is toxic to sperm and eggs (ova), preventing pregnancy.

Why is copper IUD bad?

Non-hormonal (copper) IUDs can make your periods heavier and cause cramping, especially in the first 3-6 months. And you may have some IUD cramps when you first get your IUD. For many people, these side effects get better once your body gets used to the IUD.

How effective are copper IUD's?

How effective are copper IUDs? ParaGard® is more than 99% effective. That means that out of 1,000 women, five women may get pregnant.