title: Three triphasic oral contraceptives now available in U.S.
mesh_terms: D000569:Americas; D001695:Biology; D003267:Contraception; D003268:Contraception Behavior; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D019049:Developed Countries; D003906:Developing Countries; D004703:Endocrine System; D004997:Ethinyl Estradiol; D005193:Family Planning Services; D006470:Hemorrhage; D006728:Hormones; D016912:Levonorgestrel; D009640:Norethindrone; D009656:North America; D010342:Patient Acceptance of Health Care; D010827:Physiology; D012102:Reproductive Control Agents; D012725:Sexual Behavior; D012816:Signs and Symptoms; D014481:United States
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D006728:Hormones; D012102:Reproductive Control Agents; D004997:Ethinyl Estradiol; D016912:Levonorgestrel; D009640:Norethindrone
keywords: Americas; Biology; Bleeding; Contraception--administraction and dosage; Contraception--side effects; Contraceptive Agents, Estrogen--administraction and dosage; Contraceptive Agents, Female--administraction and dosage; Contraceptive Agents, Female--side effects; Contraceptive Agents, Progestin--administraction and dosage; Contraceptive Agents--administraction and dosage; Contraceptive Agents--side effects; Contraceptive Methods--administraction and dosage; Contraceptive Methods--side effects; Contraceptive Usage; Developed Countries; Developing Countries; Endocrine System; Ethinyl Estradiol--administraction and dosage; Family Planning; Hormones--administraction and dosage; Levonorgestrel--administraction and dosage; Method Acceptability; Norethindrone--administraction and dosage; North America; Northern America; Oral Contraceptives, Combined--administraction and dosage; Oral Contraceptives, Combined--side effects; Oral Contraceptives, Phasic--administraction and dosage; Oral Contraceptives, Phasic--side effects; Oral Contraceptives--administraction and dosage; Physiology; Reproductive Behavior; Reproductive Control Agents--administraction and dosage; Signs And Symptoms; United States