Emergency contraception with levonorgestrel or the Yuzpe regimen

摘要: In response to concerns raised by both Trussell and Ellertson et al. the authors (members of WHO Task Force on Postovulatory Methods Fertility Regulation) investigated impact time elapsed since unprotected intercourse efficacy emergency contraception in more detail. Overall pregnancy rate increased from 0.5% when treatment was initiated within 24 hours 4.1% after a lapse 61-72 hours. Postponement first dose 12 likelihood almost 50%. A levonorgestrel-only regimen consistently effective than Yuzpe regimen. comparison risk associated with levonorgestrel that 7 studies pooled yields relative 0.3 (95% confidence interval 0.23-0.97)--similar reported study other conception probabilities. Since has not been updated 1973 it is review improve options.