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Mode of action

Authoring team

  • like other hormonal contraceptives, levonorgestrel might work by altering tubal motility, interfering with fertilisation, disrupting ovulation or via inhibition of the implantation of the fertilised ovum (1)
  • no specific mode of action for levonorgestrel has been defined for its role in post-coital contraception (2)

Reference:

  1. Glasier A. Emergency postoital contraception. NEJM 1997; 337: 1058-64.
  2. Drug and Therapeutics Bulletin 2000; 38 (10): 75-77.

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