Combined activity of ketoconazole and 5-fluorocytosine on potentially pathogenic yeasts

Area of Science:

• Medical Mycology
• Pharmacology
• Infectious Diseases

Background:

• Opportunistic yeast infections pose significant threats, particularly in immunocompromised individuals.
• Emerging resistance to antifungal agents necessitates the exploration of combination therapies.
• Ketoconazole and 5-fluorocytosine are established antifungal drugs with distinct mechanisms of action.

Purpose of the Study:

• To evaluate the in vitro synergistic or additive effects of ketoconazole and 5-fluorocytosine.
• To assess the efficacy of this drug combination against a range of opportunistic yeast pathogens.
• To determine if the combination is effective against yeast strains resistant to 5-fluorocytosine.

Main Methods:

• In vitro experimental design.
• Periodic viable cell count determinations.
• Testing against various opportunistic yeast species.

Main Results:

• The combined use of ketoconazole and 5-fluorocytosine demonstrated at least additive antifungal activity.
• This additive effect was observed across multiple opportunistic yeast pathogens.
• The combination therapy proved effective against some yeast strains exhibiting resistance to 5-fluorocytosine.

Conclusions:

• Ketoconazole and 5-fluorocytosine exhibit additive antifungal effects in vitro.
• Combination therapy with these agents offers a viable strategy against opportunistic yeast infections.
• This approach may overcome resistance issues associated with monotherapy, particularly for 5-fluorocytosine-resistant strains.