(ethinyloestradiol 100 pg plus levonorgestrel 0.5 mg or dl-norgestrel 1.0 mg, repeated 12 hours...
6
(ethinyloestradiol 100 pg plus levonorgestrel 0.5 mg or dl-norgestrel 1.0 mg, repeated 12 hours later). Subse- quent studies of women in various countries also 2-4 showed levonorgestrel
