Levonorgestrel as a postcoital contraceptive.
Time-release pellets of levonorgestrel (LNG), the progestogenic
component of the combined oral contraceptive (COC), were evaluated for contraceptive efficacy and safety in a multicenter, randomized, double-blind, placebo-controlled study. A total of 1,926 women were enrolled in the study and 1,926 were randomized to receive either LNG or placebo. The