Esomeprazole capsules are a proton pump inhibitor (PPI) used to reduce stomach acid production. They are commonly prescribed to treat conditions such as gastroesophageal reflux disease (GERD), erosive esophagitis, and stomach ulcers. Esomeprazole works by blocking the enzyme in the stomach lining responsible for acid secretion, helping to relieve symptoms like heartburn and acid reflux while promoting healing of the esophagus. It is typically taken once daily before a meal for optimal effectiveness.