The purpose of this study is to measure how rapidly pregabalin treatment can relieve pain in patients with post-herpetic neuralgia

Inclusion Criteria:

• Diagnosis of PHN with pain present for at least three months after the healing of a Herpes Zoster skin lesion.
• Subjects must have completed the Daily Pain Rating Scale in the electronic diary at least 4 times during screening and have an average daily pain rating score of greater than or equl to 4 during the 7 +/- 3 days prior to randomization (Visit 2).

Exclusion Criteria:

• History of neurolytic or neurosurgical therapy for PHN.
• Presence of any severe pain associated with conditions other than PHN that may confound the assessment or self-evaluation of the pain due to PHN.