Efficacy of Intrathecal Oxytocin in Patients With Neuropathic Pain

Inclusion Criteria: * Weight \< or equal to 240 pounds * Neuropathic pain for \> 6 months: with primary pain area below the umbilicus Exclusion Criteria: * Hypersensitivity, allergy, or significant reaction to any ingredient of the study drug or lidocaine * Any disease, diagnosis, or condition (medical or surgical) that, in the opinion of the Principal Investigator, would place the subject at increased risk (active gynecologic disease in which increased tone would be detrimental e.g., uterine fibroids with ongoing bleeding), compromise the subject's compliance with study procedures, or compromise the quality of the data * Pregnancy * spinal cord stimulators, chronic intrathecal drug therapy, or oral opioid treatment for \> 3 months at a current dose of \> 100 milligram (mg) morphine per day or equivalent.