The Itraconazole 200mg Capsules are used to treat fungal infections on the lungs that can spread all over the body. These capsules are used to treat fingernail fungal infections as well. Itraconazole oral solution is also prescribed to treat yeast infections inside of the mouth, nose, or esophagus which is the tube that connects the throat to the stomach. Itraconazole belongs to the triazole family of antifungals. It functions by inhibiting the growth of the fungi that lead to infection.