Nausea/ Vomiting Preventing Injection contains Ondansetron HCL, equivalent to Ondansetron and water for injection. The Injection is prescribed to prevent nausea and vomiting caused by moderately emetogenic chemotherapy. The Injection is effective if taken immediately before chemotherapy. The Nausea/ Vomiting Preventing Injection doses have to be adjusted according to severity of the emetogenic challenge.