Epidural opiates in labour.
D000767:Anesthesia, Epidural; D000773:Anesthesia, Obstetrical; D004341:Drug Evaluation; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D008614:Meperidine / Q000008:administration & dosage*; D010638:Phenoperidine / Q000008:administration & dosage*; D011247:Pregnancy
D008614:Meperidine; D010638:Phenoperidine; D005283:Fentanyl