background - the high frequency of cutaneous mycosis justify the need to evaluate the possible contribution of in vitro profile of susceptibility to antifungal agents. objective - to evaluate whether there is variability in in vitro susceptibility by filamentous fungi, previously isolated from cutaneous mycosis, to fluconazole, ketoconazole, itraconazole and terbinafine. methods - fungi were isolated and identified by classical methods and the antifungal susceptibility test was performed using the method of broth microdilution, according to a protocol recommended by the clinical laboratory standards institute (clsi), through m38-a document. results - amongst the 80 filamentous fungi identified, trichophyton genus represented 81%. the four examined drugs showed great variation for trichophyton spp and microsporum spp. fusarium spp was resistant to all tested drugs. terbinafine was the most effective drug against the majority of the isolated fungi. conclusion - there was great variability in response profiles to the tested antifungals. the definition of a reference test method will offer higher objectivity for physicians to choose the appropriate therapy.