Voriconazole is an antifungal medicine. Voriconazole is used to treat serious fungal or yeast infections, such as aspergillosis (fungal infection in the lungs), candidemia (fungal infection in the blood), esophageal candidiasis (candida esophagitis), or other fungal infections (infections in the skin, stomach, kidney, bladder, or wounds). It may also be used to treat patients with serious fungal or yeast infections who cannot tolerate other types of treatment or do not respond to other types of treatment.