...fertilized implanting in the uterus? Recent research by members of the Population Council's International Committee for Contraception Research (ICCR) and other scientists shows that the most popular method of emergency contraception appears to work by interfering with ovulation, thus preventing fertilization, and not by disrupting events that occur after fertilization.

The most common and effective form of emergency contraception contains levonorgestrel, a progestin. It is sold in the United States and Canada under the name Plan B[R]. Reproductive physiologist Horacio B. Croxatto of the Chilean Institute for...

NOTE: All illustrations and photos have been removed from this article.



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