Background: Butenafine hydrochloride, a potent antifungal agent related to the allylamines, has been used in Japan for treating various cutaneous mycoses including tinea cruris.Objective: We compared the safety and efficacy of butenafine hydrochloride and its vehicle when used once daily for 2 weeks to treat tinea cruris. Methods: Patients (n = 93) with tinea cruris and a positive potassium hydroxide examination and mycologic culture were enrolled. Of the 76 patients assessed for efficacy, 37 applied butenafine and 39 applied vehicle once daily for 2 weeks. Assessments were made at the end of the 2-week treatment period and 4 weeks after the end of treatment. Results: Patients in the butenafine group had a higher mycologic cure rate by day 7 (66% vs 13%, p < 0.0001), with marked improvement 4 weeks after the end of treatment (81% vs 13%, p < 0.0001). They also had a higher rate of effective treatment at day 7 (29% vs 5%, p < 0.01) and at 4 weeks after treatment (73% vs 5%, < 0.0001). Adverse events definitely related to butenafine treatment were limited to one case of burning sensation after application. Conclusion: Butenafine applied once daily for 2 weeks is effective in treating tinea cruris. The proportion of patients cured increased between the end of treatment and 4 weeks after treatment.
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