Isavuconazole is an antifungal medication used to treat serious fungal infections that can occur in people with weakened immune systems. This research review looked at three clinical trials comparing isavuconazole to other antifungal drugs and found it works just as well while being easier on the liver. Notably, isavuconazole caused fewer drug-related side effects and liver problems compared to voriconazole, another common antifungal drug.