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Related Experiment Videos

Postcoital contraception: a family planning study.

L A Kane1, M J Sparrow

  • 1New Zealand Family Planning Association, Wellington.

The New Zealand Medical Journal
|April 12, 1989
PubMed
Summary

The Yuzpe method, a postcoital emergency contraception, demonstrated a 2.3% failure rate in a New Zealand study. Effectiveness was higher when administered within 12 hours of unprotected intercourse.

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Area of Science:

  • Reproductive Health
  • Contraception
  • Pharmacology

Background:

  • The Yuzpe method is a widely used postcoital emergency contraception.
  • This study evaluated the efficacy and safety of the Yuzpe method in New Zealand.

Purpose of the Study:

  • To assess the effectiveness of the Yuzpe method (ethinylestradiol and d1-norgestrel) as emergency contraception.
  • To identify factors influencing the failure rate of this method.

Main Methods:

  • A prospective study involving 909 participants from six family planning clinics in New Zealand.
  • Participants used either ethinylestradiol/d1-norgestrel or levonorgestrel pills within 72 hours of unprotected intercourse.
  • Exclusion criteria included medication or hormone therapy use.
Keywords:
BehaviorContraceptionContraception FailureContraceptive AgentsContraceptive Agents, EstrogenContraceptive Agents, FemaleContraceptive Agents, PostcoitalContraceptive Agents, ProgestinContraceptive UsageDeveloped CountriesEthinyl EstradiolEvaluationFamily PlanningLevonorgestrelNew ZealandOceaniaSex Behavior

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Main Results:

  • An overall failure rate of 2.3% was observed.
  • A significantly higher failure rate (4.49%) occurred when the method was used after 48 hours.
  • A significantly lower failure rate (1.22%) was noted when used within 12 hours.
  • Vomiting occurred in 17% of participants but did not impact efficacy.

Conclusions:

  • The Yuzpe method is an effective emergency contraception option.
  • Timely administration of emergency contraception is crucial for optimal effectiveness.
  • Further research could explore strategies to mitigate side effects like vomiting.