Final answer:
Ondansetron is classified as an Antiemetic medication that is used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, or surgery. It belongs to the class of drugs known as 5-HT3 receptor antagonists.
Step-by-step explanation:
The classification of Ondansetron is Antiemetic. It is a medication that is used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, or surgery. Ondansetron belongs to the class of drugs known as 5-HT3 receptor antagonists, which work by blocking serotonin in the body. By blocking serotonin, Ondansetron helps reduce the feeling of nausea and prevent vomiting.