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Gynecol Endocrinol. 2011 Jun;27(6):439-42. doi: 10.3109/09513590.2010.501885. Epub 2010 Jul 29.

How do levonorgestrel-only emergency contraceptive pills prevent pregnancy? Some considerations.

Author information

1
Department of Gynecological and Human Reproductive Sciences, University of Padua, Italy. bruno.mozzanega@unipd.it

Abstract

Controversial opinions exist about the possible mechanisms throughout emergency contraception prevents pregnancy. Recently, the International Federation of Gynaecology and Obstetrics and the International Consortium for Emergency Contraception released a Joint Statement declaring that 'inhibition or delay of ovulation should be their primary and possibly only mechanism of action'. They still added that 'Review of the evidence suggests that LNG-ECPs cannot prevent implantation'. Concerning levonorgestrel-only emergency contraceptive pills effects on ovulation, the Statement based on seven reference papers which considered a total of only 142 patients, divided into still different subgroups. Basing on their same references we got quite different conclusions.

PMID:
20670097
DOI:
10.3109/09513590.2010.501885
[Indexed for MEDLINE]
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