Postcoital treatment with levonorgestrel does not disrupt postfertilization events in the rat.

@article{Mller2003PostcoitalTW,
  title={Postcoital treatment with levonorgestrel does not disrupt postfertilization events in the rat.},
  author={Andr{\'e}s L M{\"u}ller and Carmen Llados and Horatio B Croxatto},
  journal={Contraception},
  year={2003},
  volume={67 5},
  pages={415-9}
}
Levonorgestrel (LNG), a progestin widely used for regular hormonal contraception, is also used for emergency contraception (EC) to prevent pregnancy after unprotected intercourse. However, its mode of action in EC is only partially understood. One unresolved question is whether or not EC prevents pregnancy by interfering with postfertilization events. Here, we report the effects of acute treatment with LNG upon ovulation, fertilization and implantation in the rat. LNG inhibited ovulation… CONTINUE READING

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[Effect of levonorgestrel in the ovulation, endometrium, and spermatozoa for emergency oral contraception].

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