Used to treat conditions involving excess stomach acid, such as gastroesophageal reflux disease (GERD), peptic ulcers, and Zollinger-Ellison syndrome. It works by reducing acid production in the stomach, helping to relieve symptoms like heartburn and acid regurgitation. Often prescribed for short-term use to allow healing of esophageal and stomach lining damaged by acid. Can be combined with antibiotics to eradicate Helicobacter pylori, a bacterium linked to ulcers. Provides longer-lasting acid suppression compared to some other acid-reducing medications, making it effective for both daytime and nighttime symptom control.