Esomeprazole is a medication that is used to treat conditions caused by excess stomach acid, including gastroesophageal reflux disease (GERD), peptic ulcers, and Zollinger-Ellison syndrome. Some synonyms for esomeprazole include: 1. Nexium - This is the brand name for esomeprazole. 2. Protonix - This medication is in the same class as esomeprazole and works by decreasing the amount of acid produced in the stomach. 3. Prevacid - This medication is also used to treat conditions caused by excess stomach acid, and works in a similar way to esomeprazole. 4. Prilosec - This medication reduces the amount of acid produced in the stomach, and is often used to treat GERD and other digestive disorders.