PH-797804 Versus Placebo For The Treatment Of Neuropathic Pain Associated With Post-Herpetic Neuralgia

Inclusion Criteria: * Male or female, at least 18 years of age * Patients must have pain present for more than 3 months after healing of the Herpes zoster skin rash. There is no upper limit on the duration of PHN. * Patients at screening visit (V1) must have a score ≥40 mm on the Pain Visual Analog Score (VAS). Exclusion Criteria: * Patients having other severe pain, which may impair the self-assessment of the pain due to post-herpetic neuralgia * History within the previous year of: myocardial infarction, cardiac arrhythmia (e.g. atrial fibrillation, paroxysmal atrial fibrillation, atrial flutter, supraventricular tachycardia, ventricular tachycardia), left ventricular failure, New York Heart Association (NYHA) Class III-IV congestive heart failure requiring treatment, unstable angina, coronary angioplasty, coronary artery bypass grafting (CABG) or cerebrovascular accident (including transient ischemic attacks). * Tuberculosis without treatment and/or positive tuberculin reaction to PPD (Purified Protein Derivative) without known (documented) vaccination with the bacilli Calmette-Guerin vaccine (BCG). * A positive approved immunoassay/ELISA blood test for TB (e.g. TB T-SPOT™, QuantiFERON-Gold * Any clinically significant skin lesions as described in Common Terminology Criteria for Adverse Events for Dermatology (CTCAE) Version 3.0 * ECG abnormalities at screening or randomization * Evidence of organ dysfunction or hematopoietic disorder