To Evaluate Long-Term Safety and Efficacy of Pregabalin in Patients With Postherpetic Neuralgia.

An Open-Label Extension Safety and Efficacy Study of Pregabalin in Patients With Postherpetic Neuralgia

To evaluate long-term safety and efficacy of pregabalin in patients with postherpetic neuralgia.

Inclusion Criteria:

• Must have met the inclusion criteria for preceding double-blind BID study in postherpetic neuralgia
• Must have received pregabalin/placebo under double-blind conditions for a minimum of 3 weeks.

Exclusion Criteria:

• Patients cannot participate if they experienced a serious adverse event during preceding double-blind BID study which was determined to be related to the study medication.