Study of a Bupivacaine Patch (Eladur™) to Treat Post- Herpetic Neuralgia

Inclusion Criteria: * Male or females age 21 years or older. * Pain in thoracic or lumbar regions for a minimum of 90 days after crusting of Herpes Zoster (HZ) lesions. * Stable prescribed medications regimen (including opioids, anticonvulsants, and tricyclic antidepressants). * Intact, unbroken skin over the painful area to be treated. * Body Mass Index (BMI) no more than 35 kg/m2. Exclusion Criteria: * Active HZ lesions, dermatitis, Central Nervous System (CNS) injury. * Any immunosuppressed condition, including but not limited to AIDS/HIV and Hodgkin's lymphoma. * Pain control by nerve block or neurosurgical intervention. * Evidence of clinically significant hepatic, gastrointestinal, renal, hematologic, urologic, neurologic, respiratory, endocrine or cardiovascular system abnormalities, psychiatric disorders, or acute infection. * Connective tissue disorders (systemic lupus erythematosus, scleroderma, mixed connective tissue disease). * Recent use (within 30 days preceding the first treatment visit) of any topically applied pain medication, such as nonsteroidal anti-inflammatory drugs, menthol, methyl salicylate, local anesthetics (including Lidoderm®), steroids or capsaicin products on the painful areas. * Significant pain of an etiology other than PHN, for example, compression-related neuropathies (e.g., spinal stenosis), fibromyalgia or arthritis. Patients must not have significant ongoing pain from other cause(s) that may interfere with judging PHN related pain. * Participation in a clinical trial of an investigational product or device within 30 days of the screening visit or concurrently during the conduct of this study.