Intervention Review

Topical capsaicin (low concentration) for chronic neuropathic pain in adults

  1. Sheena Derry*,
  2. R Andrew Moore

Editorial Group: Cochrane Pain, Palliative and Supportive Care Group

Published Online: 12 SEP 2012

Assessed as up-to-date: 5 JUL 2012

DOI: 10.1002/14651858.CD010111


How to Cite

Derry S, Moore RA. Topical capsaicin (low concentration) for chronic neuropathic pain in adults. Cochrane Database of Systematic Reviews 2012, Issue 9. Art. No.: CD010111. DOI: 10.1002/14651858.CD010111.

Author Information

  1. University of Oxford, Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics), Oxford, Oxfordshire, UK

*Sheena Derry, Pain Research and Nuffield Department of Clinical Neurosciences (Nuffield Division of Anaesthetics), University of Oxford, Pain Research Unit, Churchill Hospital, Oxford, Oxfordshire, OX3 7LE, UK. sheena.derry@ndcn.ox.ac.uk.

Publication History

  1. Publication Status: Stable (no update expected for reasons given in 'What's new')
  2. Published Online: 12 SEP 2012

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Abstract

  1. Top of page
  2. Abstract
  3. Plain language summary

Background

Topical creams with capsaicin are used to treat pain from a wide range of chronic conditions including neuropathic pain. Following application to the skin capsaicin causes enhanced sensitivity to noxious stimuli, followed by a period with reduced sensitivity and, after repeated applications, persistent desensitisation. There is uncertainty about the efficacy and tolerability of capsaicin for treating painful chronic neuropathies. This is an update of an earlier review of topical capsaicin for chronic neuropathic pain in adults that looked at all doses and formulations of capsaicin. The original review has now been split: here we consider only formulations using a low concentration of capsaicin (< 1%) applied several times daily over several weeks, while another review will consider a single application of capsaicin at a high concentration.

Objectives

To review the evidence from controlled trials on the efficacy and tolerability of topically applied low-concentration (< 1%) capsaicin in chronic neuropathic pain in adults.

Search methods

Cochrane CENTRAL, MEDLINE, EMBASE and Oxford Pain Relief Database, searched to July 2012.

Selection criteria

Randomised, double-blind, placebo-controlled studies of at least six weeks' duration, using low-concentration (< 1%) topical capsaicin to treat neuropathic pain.

Data collection and analysis

Two review authors independently assessed study quality and validity, and extracted data. Information was extracted on numbers of participants with pain relief (clinical improvement) after at least six weeks, and with local skin reactions, and used to calculate relative risk (or risk ratio, RR) and numbers needed to treat to benefit (NNT) and harm (NNH). Details of definition of pain relief and specific adverse events were sought.

Main results

No additional studies were identified for this update of low concentration capsaicin. Included studies were published before 1996. Six studies (389 participants in total) compared regular application of low dose (0.075%) capsaicin cream with placebo cream. There was substantial heterogeneity in results, probably as a result of the small number of studies each with small numbers of participants, as well as the different pain conditions studied and different definitions of "clinical success" reported. Only two studies reported data for the preferred primary outcome of at least 50% pain relief, and there were too few data for pooled analysis. Local skin reactions were more common with capsaicin, usually tolerable, and attenuated with time; the NNH for repeated low-dose application was 2.5 (95% confidence interval (CI) 2.1 to 3.1). All studies satisfied minimum criteria for quality and validity, but maintenance of blinding remains a potential problem.

Authors' conclusions

There were insufficient data to draw any conclusions about the efficacy of low-concentration capsaicin cream in the treatment of neuropathic pain. The information we have suggests that low-concentration topical capsaicin is without meaningful effect beyond that found in placebo creams; given the potential for bias from small study size, this makes it unlikely that low-concentration topical capsaicin has any meaningful use in clinical practice. Local skin irritation, which was often mild and transient but may lead to withdrawal, was common. Systemic adverse effects were rare.

 

Plain language summary

  1. Top of page
  2. Abstract
  3. Plain language summary

Low-concentration capsaicin applied to the skin for chronic neuropathic pain in adults

Neuropathic pain is caused by damage to nerves, either from injury or disease. Pain is described as chronic if it has been experienced on most days for at least three months. It is unlikely that topical (rubbed on the skin), low-concentration (< 1%) capsaicin provides any useful pain relief in neuropathic pain conditions. It is known to cause local skin irritation such as burning and stinging.