title: The price of intraspinal narcotic analgesia: basic constraints.
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000009:adverse effects* / Q000378:metabolism; D000818:Animals; D002319:Cardiovascular System / Q000187:drug effects; D006801:Humans; D007278:Injections, Spinal; D011537:Pruritus / Q000139:chemically induced; D012131:Respiratory Insufficiency / Q000139:chemically induced; D014555:Urination Disorders / Q000139:chemically induced
chemical_list: D000701:Analgesics, Opioid