Ondem Syrup 30 ml is a member of a class of drugs known as "anti-emetics" and is primarily used to prevent nausea and vomiting, which typically follow cancer chemotherapy, radiation therapy, or surgery. Vomiting is the body's natural response to nausea, which is an uncomfortable sensation in which a person feels the want to aggressively empty their stomach. Ondanestron, an ingredient in Ondem Syrup 30 ml, blocks the function of serotonin, a neurotransmitter in the body that triggers nausea and vomiting. Ondem Syrup 30 ml therefore stops the feeling of nausea and vomiting brought on by ailments like surgery, cancer chemotherapy, pregnancy, or motion sickness.Disclaimer:For more information contact your physician.