Patient has been treated for type 1 or 2 diabetes mellitus with glycosylated hemoglobin

Patient has pain in both feet that occurred after onset of diabetes

Patient agrees to maintain a consistent activity level throughout the study

Patient is not on chronic pain therapy, or is on a stable dose of one pain therapy

Female patients of reproductive potential must agree to use two acceptable methods of birth control through out the study

Patients taking a pain medication must be on a stable dose at least 1 month prior to participating in study

A Study of Single Dose Pain Therapy in Patients With Painful Diabetic Neuropathy (0000-115)