title: Oral contraceptives containing only progestogens.
mesh_terms: D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects; D009644:Norgestrel / Q000008:administration & dosage; D010060:Ovulation / Q000187:drug effects; D011247:Pregnancy; D011372:Progestins / Q000008:administration & dosage*
chemical_list: D003276:Contraceptives, Oral; D011372:Progestins; D009644:Norgestrel