How effective is an IUD?

Copper IUDs, like MONA LISA® IUDs, are 99.2% effective in preventing pregnancies.

Relative efficacy of copper IUDs during the first year of typical use* compared with the common contraceptive methods.

* “TYPICAL USE” of a birth control method refers to how effective the method is during actual use (including inconsistent and incorrect use). Data adapted from the Canadian Contraceptive Consensus, 2015.