Ondavell 8 mg/4 mL Injection contains Ondansetron, an antiemetic used to prevent and treat nausea and vomiting caused by chemotherapy, radiation therapy, or surgery. Each pack contains 5 ampoules./Description: Ondavell Injection is formulated with Ondansetron, a selective 5-HT₃ receptor antagonist that works by blocking the action of serotonin, a natural substance that may cause nausea and vomiting. It is commonly prescribed to prevent and treat nausea and vomiting associated with chemotherapy, radiation therapy, and surgery.. Please Note that product description, color, ingredients, package and other information maybe different from the original pack kindly check the product for more accurate details.