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.

What is the effect of copper T?

Irregular or Heavy Periods

Hormonal IUDs (Kyleena, Liletta, Mirena, and Skyla) often make periods lighter and shorter. Sometimes they stop menstruation altogether. The copper IUD (ParaGard) may make your periods heavier for the first few months. Some women have spotting or bleeding in between periods.

What does copper t prevent?

Non-hormonal IUDs use copper to prevent pregnancy. Sperm doesn't like copper — it changes the way sperm cells move so they can't swim to an egg. If sperm can't make it to an egg, pregnancy can't happen.