What are the side effects of copper iud?

Few: Most women will have some slight cramping and/or spotting when the iud is placed. Some women will have heavier periods and/or more cramping for up to three cycles after the iud is placed. Most women have little or no side effects from a copper t iud.

Heavier period: The CopperIUD is one of the BEST forms of birth control available. It is non-hormonal (no effect on fertility/acne/headaches/nausea/wt gain/bloating/blood clots) and VERY safe (except if you have Wilson's dz/Copper allergy). The only risk is a heavier period and complications w/ insertion (RARE). It is immediately effective to prevent pregnancy but does not protect against STIs.