title: Relief of pain in labour.
mesh_terms: D000328:Adult; D001463:Barbiturates / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D008614:Meperidine / Q000627:therapeutic use*; D009020:Morphine / Q000627:therapeutic use*; D009892:Opium / Q000627:therapeutic use*; D010146:Pain / Q000188:drug therapy*; D011247:Pregnancy; D011395:Promazine / Q000627:therapeutic use*
chemical_list: D001463:Barbiturates; D009020:Morphine; D009892:Opium; D008614:Meperidine; D011395:Promazine