Two new experimental antifungal azole drugs were compared with ketoconazole for the management of experimental murine coccidioidomycosis. The first, BAY-n-7133, a triazole, was superior to the second, BAY-1-9139, an imidazole derivative. Neither BAY drug was as effective as ketoconazole in early fulminant coccidioidomycosis of mice, in later disseminated disease and in deep-seated chronic disease. A possible limitation of BAY-n-7133 in the mouse model was its reported capacity to induce enzyme changes that accelerated its clearance from serum. Induction of such an enzyme response in human beings has been reported not to occur.