Indications for use of emergency contraception include unprotected vaginal intercourse as well as missed doses of regular hormonal contraception. Hormonal emergency contraception is most effective when used within the first 24 h after unprotected intercourse. It can, however, be used within 120 h of unprotected intercourse to reduce the risk of pregnancy. Emergency contraception which may be recommended includes the FDA-approved levonorgestrel and ulipristal acetate, off-label use of combination oral contraceptives (“Yuzpe” method), or insertion of a copper IUD. The progestin-only regimens of emergency contraception contain levonorgestrel. The one-step formulation, now used, is 1.5 mg at once. The best option for women with a BMI of over 35—the copper intrauterine device—is the most effective emergency contraception and can be placed up to 120 h after unprotected intercourse and is 99.9% effective. The only true contraindication to emergency contraception in any form is known pregnancy.
KeywordsEmergency contraception Unprotected sexual intercourse Yuzpe method One-step Ulipristal acetate
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