Used primarily in the treatment of gastric acid-related conditions such as peptic ulcers and gastroesophageal reflux disease (GERD). It works by reducing the amount of acid produced in the stomach, providing relief from heartburn and allowing damaged esophageal or stomach tissue to heal. Also employed in the management of Zollinger-Ellison syndrome, a condition involving excessive gastric acid secretion. Its action as a histamine H2-receptor antagonist makes it effective for short-term symptom control and ulcer healing. Often prescribed when proton pump inhibitors are not suitable or well tolerated.