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