Vomifor-MD tablets are an anti-emetic combination that addresses Nausea, Vomiting, Morning Sickness, Gastrointestinal and motility disorders. Ondansetron is used to prevent nausea and vomiting. Ondansetron is an antiemetic medication. It works by blocking the action of a chemical messenger (serotonin) in the brain that may cause nausea and vomiting during anti-cancer treatment (chemotherapy) or after surgery.