Nexium (generic: esomeprazole) is a prescription medication used to treat gastroesophageal reflux disease (GERD). It is also used to heal acid-related damage to the lining of the esophagus (erosive esophagitis), and to prevent ulcers caused by NSAIDs and H. Pylori bacteria. Nexium belongs to a group of drugs called proton pump inhibitors which work by decreasing the amount of acid produced in the stomach.

This medication comes in capsule and powder form. It is usually taken once a day, at least one hour before a meal.

Common side effects of Nexium include headache, diarrhea, and nausea.