title: Management of chronic pain by epidural and intrathecal opioids: newer drugs and delivery systems.
mesh_terms: D000767:Anesthesia, Epidural / Q000009:adverse effects / Q000379:methods; D002408:Catheters, Indwelling; D002908:Chronic Disease; D004334:Drug Administration Schedule; D006801:Humans; D007278:Injections, Spinal / Q000009:adverse effects / Q000379:methods; D009294:Narcotics / Q000008:administration & dosage / Q000627:therapeutic use*; D010146:Pain / Q000188:drug therapy*; D012119:Respiration / Q000187:drug effects; D012984:Software; D013618:Tachyphylaxis; D013997:Time Factors
chemical_list: D009294:Narcotics