TABLE 1. Comparing the LNG IUS and the Copper IUD.

Points of Comparison	LNG IUS	Copper IUD
Main difference	Hormonal (levonorgestrel)	Nonhormonal
Main effects on menstruation	Generally decreasesmenstrual blood loss	Generally increasesmenstrual blood loss
Duration of use	5 years	10–12 years
Noncontraceptive benefits (stemming from reduced uterine bleeding)	Treats menorrhagia, increases hemoglobin, and likely alleviates anemia and problems with uterine fibroids	…
Effectiveness	Both in the highest tier of contraceptive effectiveness
Continuation rates	Both have similar, high continuation rates

Abbreviations: IUD, intrauterine device; LNG IUS, levonorgestrel intrauterine system.