Used primarily in the pharmaceutical industry as a histamine H2-receptor antagonist. It is effective in reducing stomach acid production, making it valuable in treating conditions like peptic ulcers, gastroesophageal reflux disease (GERD), and Zollinger-Ellison syndrome. Additionally, it aids in preventing stress ulcers in critically ill patients. Its application extends to research settings, where it is studied for its potential effects on gastric acid secretion and related gastrointestinal disorders.