Used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, and surgery. It works by blocking the action of serotonin, a natural substance that may trigger nausea and vomiting. Commonly administered before treatment and continued for a short period after to maintain protection. Often preferred due to its effectiveness and relatively low side effect profile. Also used off-label for managing nausea in certain gastrointestinal and neurological conditions. Available in oral, injectable, and orally disintegrating forms for flexible dosing.