Itraconazole is an antifungal medication used to treat various fungal infections, including those caused by Aspergillus and Candida species. It works by inhibiting the growth of fungi, preventing them from reproducing and spreading in the body. This medication is available in oral and intravenous forms and is often prescribed for patients with weakened immune systems or those with chronic fungal infections. Common side effects may include nausea, headache, and abdominal pain, but serious reactions can occur, so monitoring by a healthcare professional is essential during treatment.