What are disadvantages of emergency contraception methods?

Updated: Oct 06, 2020
  • Author: Frances E Casey, MD, MPH; Chief Editor: Richard Scott Lucidi, MD, FACOG  more...
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Adverse effects include nausea and emesis, minor changes in menses, breast tenderness, fatigue, headache, abdominal pain, and dizziness. See above for disadvantages related to obesity and levonorgestrel only.  Emergency contraceptive methods are not effective once implantation of a fertilized egg has occurred and thus effectiveness is completely dependent upon cycle timing with act(s) of unprotected intercourse.

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