Clinical efficacy of fluconazole on fungal infections was evaluated. Fluconazole was administrated orally or intravenously to 16 cases with fungal infections (chronic renal failure 4, congestive heart failure 2, cerebral infarction 2, etc). All cases were suspected of mycosis. The details of those administrated were 16 cases of pneumonia 3 cases, fungemia 9 cases (suspected 7 cases) and urinary tract infection 3 cases. Clinical efficacy rate was 71.4%. Side-effects were observed in only 1 case, and this consisted of transient increase of leukocytes and thrombocytes. Fluconazole is considered to be a potent, safe antifungal agent for the treatment of suspected fungal infection during intravenous hyperalimentation.