Neuropathic Pain Syndrome Patient Study (MK-0000-072)

Inclusion Criteria: * Patient has moderate to severe nerve pain due to one of the following conditions: Postherpetic neuralgia, Painful diabetic neuropathy, Small fiber neuropathy or idiopathic distal sensory polyneuropathy * Patient is able to complete questionnaires in either English or Spanish * Patient is at least 18 years of age Exclusion Criteria: * Patient is either pregnant or breastfeeding * Patient has a history of angioedema (swelling beneath the skin surface) or peripheral edema (foot, leg, and/or ankle swelling) * Patient has a history of congestive heart failure * Patient has a seizure disorder * Patient has a history of drug and/or alcohol abuse within the past 1 year * Patient failed treatment due to lack of pain relief with more than three drugs for nerve pain * Patient has had cancer (except basal cell carcinoma) within the past two years * Patient anticipates the need for surgery while participating in the study * Patient has a reported history of hepatitis B, C, or HIV infection * Patient has another type of pain that is more painful than the nerve pain * Patient has generalized anxiety disorder, untreated depression, psychosis, or post-traumatic stress disorder * Patient is involved in litigation or receives worker's compensation related to nerve pain