Clinical Trials


Study of NGX-4010 for the Treatment of Painful HIV-Associated Neuropathy (HIV-AN) or Postherpetic Neuralgia (PHN)

This study has been completed

Information provided by (Responsible Party)
NeurogesX Identifier

First received: October 3, 2005
Last updated: March 4, 2008
Last Verified: March 2008
History of Changes


The purpose of the study is to evaluate the safety and efficacy of NGX-4010 administered at intervals of no less than 12 weeks over 1 year, based on the presence or return of pain, for the treatment of painful HIV-AN and PHN. Participation is limited to former study subjects from previous trials of NGX-4010 at selected sites.

Condition Intervention Phase
Herpes Zoster
HIV Infections
Peripheral Nervous System Diseases

Drug : Capsaicin Dermal Patch
Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Multicenter, Open-Label, Phase 2 Study of NGX-4010 for the Treatment of Neuropathic Pain in Patients With Painful HIV-Associated Neuropathy (HIV-AN) or Postherpetic Neuralgia (PHN)

Further study details as provided by NeurogesX:

Primary Outcome Measures

  • Mean percent change from baseline in "average pain for the past 24 hours" NPRS score (i.e., average of scores during Weeks 12 and 48, compared to baseline).
Secondary Outcome Measures:
  • Proportion of subjects who score 2 or 3 ("Much Improved" or "Very Much Improved") on Patient Impression of Change at Weeks 12, 24, 36 and 48.
  • Proportion of subjects with significant changes in concomitant pain medication usage during the 2nd through 12th week following study patch application.

Enrollment: 100
Study Start Date: August 2005
Study Completion Date: December 2006

Detailed Description:

Study C118 is a multicenter, open-label, single-arm study for subjects who successfully completed a previous NGX-4010 study and have not received open-label or blinded NGX-4010 study patches within the 12 weeks prior to study entry. One hundred eligible subjects will receive an initial open-label NGX-4010 study patch application and up to three additional open-label NGX-4010 applications at intervals of no less than 12 weeks, based on the presence or return of pain. Eligible subjects will have moderate to severe neuropathic pain secondary to HIV-AN or PHN, with average pain levels deemed appropriate for further treatment with NGX-4010 as judged by the Investigator.



Ages Eligible for Study: Child, Adult, Senior  
Sexes Eligible for Study: All  
Accepts Healthy Volunteers: No  


Summary eligibility criteria:

  • Subjects must be in good health and have successfully completed a past trial of NGX-4010 with no past occurrence of adverse events that would contraindicate further treatment.
  • The time between the last study patch on the previous study and the first study patch on this study must be at least 12 weeks.
  • Topical pain medications are exclusionary and require washout prior to study patch application for this study.
  • Chronic, nontopical pain medications are allowed but must be stable (not as needed) for a defined period prior to first study patch application.
  • Other specific inclusion and exclusion criteria must be met prior to enrollment on the

contacts and locations

Contacts and Locations

Choosing to participate in a study is an important personal decision.Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00233155

Sponsors and Collaborators



Study Director: Jeffrey Tobias, MD NeurogesX
More Information

More Information

Responsible Party: NeurogesX Identifier: NCT00233155   History of Changes  
Other Study ID Numbers: C118  
Study First Received: October 3, 2005  
Last Updated: March 4, 2008  

Keywords provided by NeurogesX:

Neuropathic pain

Additional relevant MeSH terms:
HIV Infections
Nervous System Diseases
Herpes Zoster
Neuralgia, Postherpetic
Peripheral Nervous System Diseases
Capsaicin processed this data on September 25, 2018
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