Patient failed adequate trial of 3 or more medications or has required narcotics for pain

History of torsades de pointes

Sensitivity to quinidine or opiate drugs (codeine, etc)

Severe pain that could confound the assessment

Patient has had any amputations

Patient has participated in the past 30 days or is currently participating in another trial

Patient has previously received treatment with dextromethorphan and quinidine

Safety and Efficacy of Dextromethorphan and Quinidine in the Treatment of the Pain of Diabetic Neuropathy