Isavuconazole is primarily used as an antifungal medication to treat serious fungal infections. It is effective against a variety of fungal pathogens, including Aspergillus and Candida species. The drug is often prescribed for patients with invasive aspergillosis and mucormycosis, particularly those who are immunocompromised, such as individuals undergoing chemotherapy or organ transplantation. Isavuconazole works by inhibiting the synthesis of ergosterol, a crucial component of the fungal cell membrane, thereby disrupting its integrity and leading to cell death. Its broad-spectrum activity and favorable safety profile make it a valuable option in the management of systemic fungal infections. Additionally, it is available in both intravenous and oral formulations, offering flexibility in treatment administration.