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      Antifungal Treatment for Pityriasis Versicolor

      review-article
      1 , 2 , * , 2
      Journal of Fungi
      MDPI
      tinea versicolor, Malassezia, topical antifungals, oral antifungals, ketoconazole

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          Abstract

          Background: Pityriasis versicolor (PV), also known as tinea versicolor, is caused by Malassezia species. This condition is one of the most common superficial fungal infections worldwide, particularly in tropical climates. PV is difficult to cure and the chances for relapse or recurrent infections are high due to the presence of Malassezia in the normal skin flora. This review focuses on the clinical evidence supporting the efficacy of antifungal treatment for PV. Method: A systematic review of literature from the PubMed database was conducted up to 30 September 2014. The search criteria were “(pityriasis versicolor OR tinea versicolor) AND treatment”, with full text available and English language required. Conclusions: Topical antifungal medications are the first-line treatment for PV, including zinc pyrithione, ketoconazole, and terbinafine. In cases of severe or recalcitrant PV, the oral antifungal medications itraconazole and fluconazole may be more appropriate, with pramiconazole a possible future option. Oral terbinafine is not effective in treating PV and oral ketoconazole should no longer be prescribed. Maintenance, or prophylactic, therapy may be useful in preventing recurrent infection; however, at this time, there is limited research evaluating the efficacy of prophylactic antifungal treatment.

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          Most cited references65

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          Terbinafine: mode of action and properties of the squalene epoxidase inhibition.

          N. Ryder (1992)
          Terbinafine (Lamisil) has primarily fungicidal action against many fungi as a result of its specific mechanism of squalene epoxidase inhibition. Treated fungi accumulate squalene while becoming deficient in ergosterol, an essential component of fungal cell membranes. The cidal action is closely associated with the development of high intracellular squalene concentrations, which are believed to interfere with fungal membrane function and cell wall synthesis. In the case of Candida albicans, growth inhibition with terbinafine appears to result from the ergosterol deficiency. The filamentous form of this fungus is more susceptible than the yeast form. Measurement of ergosterol biosynthesis by incorporation of radiolabelled precursors indicates a correlation between inhibition of growth and ergosterol biosynthesis in a range of pathogenic fungi. Terbinafine is a potent non-competitive inhibitor of squalene epoxidase from Candida (Ki = 30 nM). In contrast, inhibition of rat liver squalene epoxidase only occurs at higher drug concentrations (Ki = 77 microM), and is competitive with squalene. Thus, terbinafine has no effect on cholesterol biosynthesis in vivo. Squalene epoxidase is not an enzyme of the cytochrome P-450 type, thereby avoiding potential inhibition of this class of enzymes.
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            A cohort study on the risk of acute liver injury among users of ketoconazole and other antifungal drugs.

            The aim of this cohort study was to estimate the risk of clinical acute liver injury among users of oral antifungals identified in the general population of the General Practice Research Database in UK. The cohort included 69 830 patients, 20-79 years old, free of liver and systemic disease, who had received at least one prescription for either oral fluconazole, griseofulvin, itraconazole, ketoconazole, or terbinafine between 1991 and 1996. Sixteen cases of acute liver injury were identified and validated. Ten cases occurred during nonuse of oral antifungals with a background rate of 0.6 per 100,000 person-months (95% confidence interval 0.3,1.1). Five cases occurred during current use of oral antifungals. Two were using ketoconazole, another two itraconazole, and one terbinafine. Incidence rates of acute liver injury were 134.1 per 100 000 person-months (36.8,488.0) for ketoconazole, 10.4 (2.9-38.1) for itraconazole, and 2.5 (0.4,13. 9) for terbinafine. The remaining case was associated with past use of fluconazole. Ketoconazole was the antifungal associated with the highest relative risk, 228.0 (95% confidence interval 33.9,933.0), when compared with the risk among nonusers, followed by itraconazole and terbinafine with relative risks of 17.7 (2.6,72.6) and 4.2 (0.2, 24.9), respectively. Ketoconazole and itraconazole were the two oral antifungal associated with a marked increase of clinical acute liver injury. The risk associated with ketoconazole should be taken into account when prescribing it as initial treatment for uncomplicated fungal infections.
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              Evidence-based Danish guidelines for the treatment of Malassezia-related skin diseases.

              Internationally approved guidelines for the diagnosis and management of Malassezia-related skin diseases are lacking. Therefore, a panel of experts consisting of dermatologists and a microbiologist under the auspices of the Danish Society of Dermatology undertook a data review and compiled guidelines for the diagnostic procedures and management of pityriasis versicolor, seborrhoeic dermatitis and Malassezia folliculitis. Main recommendations in most cases of pityriasis versicolor and seborrhoeic dermatitis include topical treatment which has been shown to be sufficient. As first choice, treatment should be based on topical antifungal medication. A short course of topical corticosteroid or topical calcineurin inhibitors has an anti-inflammatory effect in seborrhoeic dermatitis. Systemic antifungal therapy may be indicated for widespread lesions or lesions refractory to topical treatment. Maintenance therapy is often necessary to prevent relapses. In the treatment of Malassezia folliculitis systemic antifungal treatment is probably more effective than topical treatment but a combination may be favourable.
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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                J Fungi (Basel)
                J Fungi (Basel)
                jof
                Journal of Fungi
                MDPI
                2309-608X
                12 March 2015
                June 2015
                : 1
                : 1
                : 13-29
                Affiliations
                [1 ]Department of Medicine, University of Toronto, Toronto, ON M5G 2C4, Canada
                [2 ]Mediprobe Research Inc., London, ON N5X 2P1, Canada; E-Mail: kfoley@ 123456mediproberesearch.com
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: agupta@ 123456execulink.com ; Tel.: +1-519-851-9715.
                Article
                jof-01-00013
                10.3390/jof1010013
                5770013
                29376896
                b3879b28-565b-4a7d-9f65-233716288201
                © 2015 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 24 December 2014
                : 04 March 2015
                Categories
                Review

                tinea versicolor,malassezia,topical antifungals,oral antifungals,ketoconazole

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