Ondansetron is a prescription medication used to prevent nausea and vomiting caused by chemotherapy or surgery. Ondansetron belongs to a group of drugs called serotonin 5-HT3 antagonists, which block serotonin, a natural chemical in the body, from causing nausea and vomiting.
This medication comes in several oral forms: tablets, orally disintegrating (dissolving) tablets, an oral soluble film, and solution (liquid). Ondansetron also comes in an intravenous (IV) form.
The first oral dose of ondansetron is usually taken 30 minutes before the start of chemotherapy, 1 to 2 hours...