Research on mifepristone and levonorgestrel in comparison with the Yuzpe regimen.
During the last decade, the UNDP/UNFPA/WHO/World Bank Special Program of Research, Development, and Research Training in Human Reproduction has been in the forefront of research on new methods of emergency contraception. This research has focused on both levonorgestrel and mifepristone. The results of large clinical studies suggest that both these compounds are better tolerated and even more effective than the Yuzpe regimen. This article, intended for purposes of continuing medical education, summarizes the findings of studies that have compared these three approaches to emergency contraception.