Posaconazole is an antifungal medication used to prevent and treat fungal infections, particularly in patients with weakened immune systems. It belongs to a class of drugs known as triazoles, which work by inhibiting the growth of fungi. This medication is often prescribed for individuals undergoing chemotherapy or those with conditions like HIV/AIDS that increase the risk of fungal infections. Posaconazole can be taken orally in tablet form or as a liquid suspension, and it is important for patients to follow their healthcare provider's instructions for dosage and administration.