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  • Title: Topical capsaicin as an adjuvant analgesic.
    Author: Watson CP.
    Journal: J Pain Symptom Manage; 1994 Oct; 9(7):425-33. PubMed ID: 7822881.
    Abstract:
    Topical capsaicin has been studied in a variety of conditions by uncontrolled and controlled trials. It is attractive because it is a simple, safe treatment. Although these studies suggest an analgesic effect, even placebo-controlled trials have been impossible to blind due to the burning sensation induced by the capsaicin. A high placebo response rate in the controlled trials is an interesting observation and may account for the apparent salutary effect reported in the studies lacking a control. A careful scrutiny of the results of these trials to date as well as clinical experience indicate at best a modest effect with the currently available preparations with many patients failing to find relief, finding the relief unsatisfactory, or being unable to tolerate the burning sensation. Occasional patients appear to have a very good result, and these unusual cases may not be reflected by clinical trials. Topical capsaicin is generally not satisfactory as a sole therapy for chronic painful conditions, although it may serve as an adjuvant to other approaches.
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