title: Ella: a new emergency contraceptive.
mesh_terms: D002986:Clinical Trials as Topic; D003281:Contraceptives, Postcoital / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*; D004347:Drug Interactions; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000009:adverse effects / Q000627:therapeutic use; D009649:Norpregnadienes / Q000009:adverse effects / Q000494:pharmacology / Q000627:therapeutic use*
chemical_list: D003281:Contraceptives, Postcoital; D009649:Norpregnadienes; D016912:Levonorgestrel; C555622:ulipristal acetate