Naltrexone and Clonidine Combination (ATNC05) in the Treatment of Chronic Back Pain

Inclusion Criteria: The subject has chronic back pain for \> 3 months in the lumbar, thoracic or cervical regions. The average pain intensity scale during the screening week is 4/10 - 8/10 (On an 11-point Numeric Pain Intensity Scale with 0 = no pain and 10 = worst pain imaginable). The subject has not taken Opioid medications 7 days prior to initiation of study drug. The subject has a heart rate of 60bpm or above and/or systolic blood pressure 90 or above. The subject is willing to refrain from using NSAIDS, Acetaminophen or muscle relaxants, unless for rescue, for the duration of the study The subject is willing to refrain from using Opioid medications and excessive alcohol for the duration of the study. The subject is able to read, understand and follow the study instructions, including completion of questionnaires at home. The subject must sign an informed consent document indicating willingness to participate. If the subject is a female, she must be post-menopausal, not currently pregnant or nursing. A female of child bearing potential should be using a reliable contraception method during the course of the study. Exclusion Criteria: The subject has a positive urine drug screen. The subject has a history of significant neurological, hepatic, renal, endocrine, cardiovascular, gastrointestinal, pulmonary, or metabolic disease. The subject has any significant deviations from normal in physical examination, electrocardiogram (ECG), Echocardiogram or clinical laboratory tests, as evaluated by the investigator. The subject has a history of an allergic reaction to the components of the study drug. The subject has acute back or cervical pain. The subject has muscular back or cervical pain. The subject has back or cervical pain other than chronic Radicular pain.