Pregabalin for Treatment of Patients With Postherpetic Neuralgia (PHN)

An 8-week Randomized, Double Blind, Multi-center, Placebo-controlled Study To Evaluate The Efficacy, Safety And Tolerability Of Pregabalin ( 300mg/Day ) Using A Fixed Dosing Schedule In The Treatment Of Subjects With Postherpetic Neuralgia ( Phn )

To prove pregabalin is effective in relieving pain compared with placebo in subjects with postherpetic neuralgia (PHN).

Inclusion Criteria:

• Male or female Chinese subjects, ages ≥18 at screening
• Subjects with symptoms of neuropathic pain associated with postherpetic neuralgia (PHN). Subjects must have pain present for ﹥3 months after healing of the acute herpes zoster skin rash
• At screening (V1), subjects must have a score ≥40mm on the 100-mm visual analog scale (VAS) of the Short Form-McGill Pain Questionnaire (SF-MPQ, see Appendix 3)
• At randomization (V2), subjects must have a score ≥40mm on the 100-mm visual analog scale (VAS) of the Short Form-McGill Pain Questionnaire (SF-MPQ, see Appendix 3)
• At randomization (V2), subjects must have completed at least 5 daily pain diaries (DPRS, see Appendix 2) and have an average daily pain score ≥4 over the past 7 days

Exclusion Criteria:

• Subjects who demonstrate a high response to placebo, with 30% decrease on the Pain Visual Analog Scale (VAS) at randomization as compared to screening
• Subjects who have a high variability in pain scores during the 1 week screening period, with any difference between two scores ﹥3