title: Tricycle pill regime.
mesh_terms: D000568:Amenorrhea; D001695:Biology; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D004194:Disease; D004703:Endocrine System; D004958:Estradiol; D004967:Estrogens; D004997:Ethinyl Estradiol; D005193:Family Planning Services; D006728:Hormones; D006805:Human Experimentation; D008234:Lynestrenol; D008599:Menstruation Disturbances; D010827:Physiology; D012106:Research
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D004967:Estrogens; D006728:Hormones; D004997:Ethinyl Estradiol; D004958:Estradiol; D008234:Lynestrenol
keywords: Amenorrhea; Biology; Clinical Research; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods; Contraceptive Methods--side effects; Diseases; Endocrine System; Estradiol; Estrogens; Ethinyl Estradiol; Family Planning; Hormones; Human Volunteers; Lynestrenol; Menstruation Disorders; Oral Contraceptives, Combined; Oral Contraceptives--side effects; Physiology; Research Methodology