Compositions and methods for inhibiting fungal growth by administering AR-12 to a host infected with a fungus such as Histoplasma capsulatum, Aspergillus fumigatus, and Trichophyton rubrum, Paecilomyces, Rhizopus, Fusarium, Scedosporium, Lomentospora, Apophysomyces, Coccidioides, Blastomyces, non-albicans Candida, and Pneumocytis are provided.