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Related Experiment Videos

Emergency contraception.

A Glasier1

  • 1Lothian Primary Care NHS Trust and Department of Obstetrics and Gynaecology, University of Edinburgh, Edinburgh, UK.

British Medical Bulletin
|March 20, 2001
PubMed
Summary
This summary is machine-generated.

Emergency contraception knowledge is limited globally. Levonorgestrel is a highly effective and well-tolerated option, likely to be preferred for preventing unwanted pregnancies.

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Area of Science:

  • Reproductive Health
  • Pharmacology

Background:

  • Global knowledge and utilization of emergency contraception (EC) remain significantly limited.
  • Current EC methods include the Yuzpe regimen and levonorgestrel-only preparations.

Purpose of the Study:

  • To review the efficacy and mechanisms of available emergency contraception methods.
  • To discuss factors influencing accessibility and potential future directions in EC provision.

Main Methods:

  • Review of recent research on emergency contraception efficacy and mechanisms.
  • Analysis of comparative effectiveness and tolerability of different EC regimens.

Main Results:

  • Levonorgestrel is as effective as the Yuzpe regimen but better tolerated.

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  • Mifepristone demonstrates high efficacy at non-abortifacient doses.
  • All current EC methods prevent at least 74% of unwanted pregnancies.
  • The Yuzpe regimen's mechanism involves inhibiting or delaying ovulation; implantation prevention is not well-evidenced.
  • Levonorgestrel's mechanism of action is not fully elucidated; mifepristone's depends on the reproductive cycle timing.

    • Conclusions:

    • Levonorgestrel is poised to become the preferred EC method due to its efficacy and tolerability.
    • Accessibility barriers, such as prescription requirements, need addressing.
    • Advanced provision of EC could significantly reduce unwanted pregnancies.