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 in the body that can 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. Available in oral, injectable, and dissolvable tablet forms for flexible dosing in various clinical settings.