“…3 IUCs, including the levonorgestrelreleasing IUC and copper-containing IUC, are highly effective in preventing pregnancy, with pregnancy rates less than 1 per 100 woman-years. 25 Excellent candidates include women who desire inter-pregnancy interval of more than 2 to 3 years, desire long-term contraception but prefer to avoid sterilization, breastfeeding women, women with side effects from hormonal contraception, and women with prior birth control failures, 17 though all women who desire highly effective contraception should be considered candidates. In general, disadvantages include the uncommon side effects of uterine perforation, expulsion and discontinuation secondary to side effects, such as increased vaginal bleeding in copper-containing devices and decreased vaginal bleeding in progesterone-releasing.…”