Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF Listen ++ For further information, see CMDT Part 18-12: Contraception + Key Features Download Section PDF Listen +++ ++ Information on clinics or individual clinicians providing emergency contraception in the United States may be obtained by calling 1-888-668-2528 All victims of sexual assault should be offered emergency contraception + Treatment Download Section PDF Listen +++ +++ Medication ++ The following methods should be started within 120 h after unprotected coitus: Levonorgestrel, 1.5 mg given orally in single dose Has a 1–2% failure rate when taken within 72 hours Available in the United States prepackaged as Plan B If the levonorgestrel regimen is not available, a combination oral contraceptive containing ethinyl estradiol and levonorgestrel given twice in 12 hours may be used Failure rate of these regimens is approximately 3% Anti-nausea medication is often necessary Ulipristal, 30 mg orally as a single dose Has been shown to be more effective than levonorgestrel, especially when used between 72 and 120 hours, particularly among overweight women It is available by prescription in the United States and western Europe +++ Intrauterine Devices ++ Copper-bearing intrauterine devices (IUDs) Prevents pregnancy when inserted within 5 days after one episode of unprotected midcycle coitus Most effective available method for emergency contraception, with first cycle pregnancy rates of 0.1%