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Updated: Apr 28, 2026
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Use of the Operant Orofacial Pain Assessment Device OPAD to Measure Changes in Nociceptive Behavior
Published on: June 10, 2013
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Capsaicin for osteoarthritis pain
Summary
Topical capsaicin effectively reduces osteoarthritis pain for up to 20 weeks, regardless of dose or joint. This treatment is safe and well-tolerated, with mild application site burning decreasing over time.
Area of Science:
- Rheumatology
- Pharmacology
- Pain Management
Background:
- Osteoarthritis (OA) pain management remains a challenge.
- Topical capsaicin is a potential treatment, but its efficacy, dose-response, and long-term effects require clarification.
Purpose of the Study:
- To systematically review randomized controlled trials on topical capsaicin for osteoarthritis pain.
- To assess the efficacy, consistency across joints, and temporal effects of topical capsaicin treatment.
Main Methods:
- Systematic review of randomized controlled trials (RCTs) and a case-crossover trial.
- Searches conducted in PubMed, EMBASE, and ISI Web of Knowledge.
- Standardized Mean Differences (SMD) used to assess pain scores, global treatment evaluation, and application site burning.
Main Results:
- Five RCTs and one case-crossover trial were included, with capsaicin formulations from 0.025% to 0.075% and trial durations from 4 to 12 weeks.
- Topical capsaicin demonstrated moderate efficacy in reducing VAS pain scores (SMD = 0.44) over 4 weeks, with no significant heterogeneity between studies regarding OA site or concentration.
- While mild application site burning was common (35-100%), it peaked in week 1 and declined over time. No systemic toxicity was reported. Efficacy was maintained up to 20 weeks in longer-term studies.
Conclusions:
- Topical capsaicin, applied four times daily, is moderately effective for reducing pain intensity in patients with moderate OA.
- The efficacy is consistent across different joint sites and doses, and the treatment is well-tolerated.
- Benefits persist for up to 20 weeks, with manageable side effects.
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