Esomeprazole is used for:

Treating heartburn or esophagitis (inflammation of the food pipe) due to acid reflux disease (GERD). It may be used to prevent stomach ulcers associated with nonsteroidal anti-inflammatory drugs (NSAIDs). It may also be used with other medicines to prevent ulcers of the small intestines.

Esomeprazole is an acid pump inhibitor (or proton pump inhibitor). It works by turning off some of the acid pumps in the stomach lining and reducing the amount of acid backing up into the esophagus (food pipe)...