Cresemba, also known by its generic name isavuconazonium sulfate, is an antifungal medication used in the treatment of serious fungal infections, particularly invasive aspergillosis and invasive mucormycosis. These types of infections are most common in individuals with weakened immune systems, such as those undergoing cancer treatments or organ transplant recipients. Cresemba works by inhibiting the growth of fungi, thereby stopping the spread of the infection. It is available in both oral and intravenous formulations, allowing for flexibility in administration based on the patient's condition and healthcare provider's recommendation. Due to its potent antifungal properties and the severity of the infections it treats, Cresemba is often reserved for use when other antifungal treatments are not suitable or have failed.