title: Clinical trial of a post-coital contraceptive pill.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D003281:Contraceptives, Postcoital / Q000008:administration & dosage* / Q000009:adverse effects / Q000494:pharmacology; D004717:Endometrium / Q000187:drug effects; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D009644:Norgestrel / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology; D011247:Pregnancy
chemical_list: D003281:Contraceptives, Postcoital; D009644:Norgestrel; D016912:Levonorgestrel