Palonosetron Hydrochloride is primarily used in the prevention and treatment of chemotherapy-induced nausea and vomiting (CINV). It is particularly effective in managing delayed CINV, which occurs more than 24 hours after chemotherapy. This medication is also utilized to prevent postoperative nausea and vomiting (PONV) in patients undergoing surgical procedures. Its long half-life and high receptor binding affinity make it a preferred choice for single-dose administration, offering sustained relief. It is often included in antiemetic regimens for patients receiving highly emetogenic chemotherapy, enhancing patient comfort and adherence to treatment protocols.