title: Quartette: an ascending-dose, extended-cycle oral contraceptive.
mesh_terms: D002986:Clinical Trials as Topic; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D017277:Drug Approval; D004347:Drug Interactions; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D016912:Levonorgestrel / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D003277:Contraceptives, Oral, Combined; D004997:Ethinyl Estradiol; D016912:Levonorgestrel