Ondansetron Hydrochloride Injection is a potent antiemetic, mainly used for the treatment of nausea and vomiting after chemoradiotherapy, it can also be used for the treatment of postoperative nausea and vomiting. It is mainly metabolized by the liver, so when the renal function is abnormal, there is no need to reduce the dosage or reduce the frequency of use, while when the liver function is abnormal, the dosage needs to be reduced, it can be secreted through breast milk, so nursing women are prohibited from breastfeeding if they are using this product, its half-life of injectable formulations is 3 hours, and that of the oral formulations is 5 hours.