If a woman takes this pill just as she is about to ovulate (mid-cycle), ovulation will be delayed for 24-48 hours.
Understand, however, that sperm can live in healthy, fertile cervical mucus for three to five days. Ulipristal acetate is not as effective in women weighing over 195 lbs. This form is not over the counter and does require a prescription.
Common side effects for both can include nausea, vomiting, cycle changes or delay, and abdominal pain.
As neither pill is 100 percent effective in preventing pregnancy, there is always the chance that a woman will still become pregnant despite taking one of these pills. If she vomits within three hours of taking either pill, she will need to repeat the dose.
If a woman has any questions, she is encouraged to talk with either her health care provider or her pharmacist as soon as possible in order to have the greatest preventive effect, should she choose to take either pill.
Bastianelli, C., and Farris, M. Emergency Contraception. Expert Rev of Obstet Gynecol. 2011;6(5):569-576.
Linden, J., Mathews, J. (2014). Emergency Contraception After Rape.
Retrieved from http://www.medscape.com/viewarticle/824148_1
Reviewed July 17, 2014
by Michele Blacksberg RN
Edited by Jody Smith