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Interventions for emergency contraception.

Jie Shen1, Yan Che, Emily Showell

  • 1Centre for Clinical Research and Training, Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD, Fudan University, 2140 Xie Tu Road, Shanghai, China.

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Summary
This summary is machine-generated.

Emergency contraception (EC) methods vary in effectiveness. Mifepristone and ulipristal acetate (UPA) generally show higher pregnancy prevention rates compared to levonorgestrel and the Yuzpe regimen. Side effect profiles also differ among these options.

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Area of Science:

  • Reproductive Health
  • Pharmacology
  • Evidence-Based Medicine

Background:

  • Emergency contraception (EC) is crucial for preventing pregnancy after unprotected intercourse.
  • Comparative data on EC effectiveness, safety, and convenience is vital for healthcare providers and patients.
  • This review is an update of previous Cochrane reviews on EC from 2009 and 2012.

Purpose of the Study:

  • To determine the most effective, safe, and convenient emergency contraception method.
  • To compare the efficacy of various emergency contraceptive pills (ECPs) and the copper intrauterine device (Cu-IUD).

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs) eligible for EC following unprotected intercourse.
  • Searched multiple databases including CENTRAL, MEDLINE, Embase, PsycINFO, CINAHL, Popline, PubMed, and specialized databases.
  • Primary outcome: observed number of pregnancies; secondary outcomes: side effects and menstrual cycle changes.

Main Results:

  • Mifepristone (all doses) and levonorgestrel were more effective than the Yuzpe regimen in preventing pregnancy.
  • Mid-dose mifepristone (25-50 mg) and low-dose mifepristone (<25 mg) were likely more effective than levonorgestrel.
  • Ulipristal acetate (UPA) may be more effective than levonorgestrel; Cu-IUD effectiveness compared to mifepristone was inconclusive.
  • Nausea and vomiting were common side effects, with lower risks associated with mifepristone and levonorgestrel compared to Yuzpe.
  • Menstrual delay was a notable side effect of mifepristone, appearing dose-related; Cu-IUD may increase abdominal pain risk.

Conclusions:

  • Levonorgestrel and mid-dose mifepristone are more effective than the Yuzpe regimen for emergency contraception.
  • Mifepristone (both low and mid-dose) and UPA demonstrate probable or potential increased effectiveness over levonorgestrel.
  • Side effect profiles vary, with mifepristone associated with menstrual delay and Cu-IUD with potential abdominal pain.