Spinal opiates.
D000208:Acute Disease; D002908:Chronic Disease; D006801:Humans; D007278:Injections, Spinal / Q000009:adverse effects / Q000379:methods*; D009294:Narcotics / Q000008:administration & dosage*; D010146:Pain / Q000188:drug therapy*; D011957:Receptors, Opioid / Q000187:drug effects
D009294:Narcotics; D011957:Receptors, Opioid