Emergency contraception interventions are intended to prevent an unplanned pregnancy after unprotected or inadequately protected intercourse. Contraceptive failure or failure to use contraception are common indications for use.
All of the methods below are effective only before a pregnancy is established. Hormonal EC does not pose a risk to an established pregnancy and is not associated with embryonal developmental abnormalities. Adverse effects for all of the oral methods include nausea and headache as well as irregular bleeding. Adverse effects for the copper IUD include perforation, changes in menses or dysmenorrhea. Pregnancy rates after EC range from 0% to 2.2% and may be impacted by body weight.
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