Contraception
How effective is emergency contraception? Gynecologist in Seoul, Korea
The short answer
Emergency pills prevent most pregnancies that would otherwise occur, and they work best the sooner you take them. Levonorgestrel is used within 72 hours; ulipristal acetate can be used up to 120 hours and is generally more effective later in that window. They are less effective than regular contraception.
Emergency pills mainly delay ovulation and are not an abortion pill. See emergency contraception and regular options like the pill.
Answered by Dami Women's Clinic (다미산부인과의원), Yeouido, Seoul · Dr. Ko Sang-hyun, OB/GYN. General information, not a diagnosis. Emergencies in Korea: call 119. Medical disclaimer · International Patient Center