Raciper 40 mg Injection belongs to the class of proton pump inhibitors. It is used as a short-term treatment of gastroesophageal reflux disease (GERD) and stomach ulcers caused by NSAIDs. It contains esomeprazole, which helps decrease the amount of acid in the stomach. Some of the common side effects include headache, diarrhoea, constipation, abdominal pain, flatulence, vomiting, nausea, etc