Intrathecal beta-endorphin.
D004361:Drug Tolerance; D004723:Endorphins / Q000008:administration & dosage*; D006801:Humans; D007278:Injections, Spinal; D009294:Narcotics / Q000008:administration & dosage; D010148:Intractable Pain / Q000188:drug therapy*
D004723:Endorphins; D009294:Narcotics