Rationale: The investigators anticipate that oxytocin will be effective after spinal injection in humans to acutely relieve chronic neuropathic pain.~Objectives: Determine the effect of intrathecal oxytocin on pain and areas and intensity of hyperalgesia and allodynia in patients with chronic neuropathic pain.~Interventions: A computer generated randomization will be used to determine the group for each subject. Subjects will be randomized to receive an intrathecal injection of saline (placebo) or oxytocin.
The purpose of the study is to determine the effect of oxytocin given into the spinal fluid on pain and areas and intensity of hyperalgesia and allodynia in patients with chronic neuropathic pain.