Ondansetron blocks the actions of chemicals in the body that can trigger nausea, vomiting and Omeprazole inhibits the acid secretion which gives relief in ulcers.

["Take exactly as prescribed by your doctor. Follow all directions on your prescription label. It is to be taken empty stomach."]

--Omeprazole: Headache, rash, dizziness, diarrhea, nausea, abdominal pain, constipation, flatulence, vomiting, fever, upper respiratory infection symptoms, cough Ondansetron: Headache, malaise/fatigue, constipation, diarrhea, dizziness, flushing, abnormal vision, hypoxia, hypokalemia, arrhythmias, chest pain with/without ST segment, seizure, extrapyramidal reactions, hypersensitivity reactions