WESTRA 200 are used to treat fungal infections in the lungs that can spread throughout the body. Itraconazole Capsules are also used to treat fungal infections of the fingernails. Itraconazole Tablets and Capsules are used to treat fungal infections of the toenails. Itraconazole oral solution (liquid) is used to treat yeast infections of the mouth and throat or of the esophagus (tube that connects the throat to the stomach). Itraconazole is in a class of antifungals called triazoles. It works by slowing the growth of fungi that cause infection.