An Open-Label Extension Study of NGX-4010 for the Treatment of Neuropathic Pain

Key Eligibility Criteria: * Must have completed NeurogesX Study C111 and received treatment with NGX-4010 (Capsaicin Patch) within 12 weeks (up to +7 days) before entry into Study C114. * Demonstrated adherence to protocol requirements during Study C111, and willing and able to comply with protocol requirements for the duration of the study participation. * Must not have had any serious adverse experience since enrollment in Study C111, whether or not considered to be study drug-related. * Must have intact skin at the treatment area. * Must be prepared to remain on the same pain medications at the same doses as before the study for the entire duration of the study (36 weeks). * Must not use topical pain medications on painful areas. * Must be at least 18 years old, not pregnant, and able to take care of self independently, with only occasional assistance if needed. * No history or current problem with substance abuse.