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The use of the progestogen-only pill as a 'pre-coital contraceptive'was tested by in vitro studies of sperm-mucus interaction. The results suggest that a single tablet of levonorgestrel 30 µ g, or norethisterone 350 µ g, was effective in preventing sperm migration in the cervical mucus about 12 hours later. This suggests that the progestogen-only pill may be effective as a 'morning before pill'.doi:10.1783/147118900101194418 fatcat:zzfn6ss575cgbh3kme5ilhs2iu