IVEMEND (fosaprepitant) is a medication used in the prevention of nausea and vomiting associated with chemotherapy and surgery. It belongs to a class of drugs known as neurokinin 1 (NK1) receptor antagonists. By blocking the action of substance P, a natural substance in the brain that is thought to be linked to nausea and vomiting, IVEMEND effectively prevents these symptoms. It is often used in combination with other anti-nausea medications to enhance its effectiveness. IVEMEND is available in both oral and intravenous forms, making it versatile for different patient needs. Its use is particularly important in patients undergoing highly emetogenic cancer chemotherapy, where the risk of severe nausea and vomiting is high.