Primary Care Identification Of Patients With Chronic Neuropathic Low Back Pain Study

Inclusion Criteria: * Patients must have low back pain with a neuropathic pain component between 3 months and 12 months duration prior to entering the study. * Patients must have a score of at least 19 on the PainDetect questionnaire and at least 4 on the Standardized Evaluation of Pain (StEP) scale at screening. * Patients must have a mean pain numerical rating scale (NRS) score of 4 or more during the one week screening period. * Patients must have failed to respond to standard analgesic therapy (e.g. non-steroidal anti-inflammatory drugs \[NSAIDs\]) and/or one treatment for neuropathic pain (e.g. tricyclics, serotonin-norepinephrine re-uptake inhibitors \[SNRIs\]) prior to entering the study). Exclusion Criteria: * A diagnosis of depression or a Hospital Anxiety and Depression Scale (HADS) score of \> 15 on the depression sub-scale only. * Patients with a history of renal impairment or who have reduced renal function at baseline (Creatinine Clearance \< 60 mL/min). * Patients who have previously taken pregabalin or gabapentin within 6 months prior to entering the study. * Patients who have undergone previous surgery for back pain. * Patients who are using high doses of opioid medication (morphine \> 60 mg per day).