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How Effective Is Emergency Contraception?

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Method	Percentage of Women Who Become Pregnant Because Emergency Contraception Is Unsuccessful
Copper-releasing IUD	0.1%
Levonorgestrel-releasing IUD (high dose)Levonorgestrel-releasing IUD (high dose)	0.3%
Levonorgestrel taken by mouthLevonorgestrel taken by mouth	2–3%
Ulipristal acetate (a single dose)Ulipristal acetate (a single dose)	1.5%
IUD = intrauterine device.