Abstract
In this study, time-kill methods were used to evaluate the antifungal activity of amphotericin B and flucytosine, alone and in combination, against six isolates of Candida albicans and Cryptococcus neoformans. Five regimens were tested against each isolate: (1) flucytosine, (2) low-dose amphotericin B, (3) high-dose amphotericin B, (4) low-dose amphotericin B plus flucytosine, and (5) high-dose amphotericin B plus flucytosine. Low-dose amphotericin B and flucytosine, administered alone and simultaneously, demonstrated fungistatic activity against all sample isolates except C. albicans 90028, in which fungicidal activity was detected with the combination. High-dose amphotericin B, alone and in combination, resulted in a rapid fungicidal effect in all isolates. In both the low and high-dose combinations, indifferent activity was demonstrated against all tested isolates. By virtue of the absence of an antagonistic interaction between these two agents, complementary pharmacokinetic profiles, and non-overlapping toxicities, continued clinical use of these agents in combination may be considered.
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