Itraconazole is a triazole with a mechanism of action similar to that of ketoconazole. Endocrine side effects of ketoconazole, including impaired cortisol synthesis, have been well documented (A. Pont, J. R. Graybill, P. C. Craven, J. N. Galgiani, W. E. Dismukes, R. E. Reitz, and D. A. Stevens, Arch. Intern. Med. 144:2150-2153, 1984). We examined the adrenal response to corticotropin in 10 patients being treated with itraconazole. No impairment of cortisol synthesis could be demonstrated.