 - If subject is not currently receiving a tricyclic antidepressant, anticonvulsant, andor Class I antiarrhythmic e.g., amitriptyline, mexiletine, phenytoin, gabapentin or carbamazepine for treatment of pain or any other condition, subject must be willing and able to abstain from initiation of these agents within 4 weeks prior to randomization and throughout the study. 