title: Fertility regulation using "triphasic" administration of ethinyl estradiol and levonorgestrel in comparison with the 30 plus 150 micrograms fixed dose regime.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D003276:Contraceptives, Oral / Q000008:administration & dosage*; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D004997:Ethinyl Estradiol / Q000008:administration & dosage* / Q000009:adverse effects; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects*; D008599:Menstruation Disturbances / Q000139:chemically induced; D009644:Norgestrel / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D011897:Random Allocation; D013237:Stereoisomerism
chemical_list: D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D009644:Norgestrel; D004997:Ethinyl Estradiol