Used primarily as an active pharmaceutical ingredient in medications for the treatment of gastric acid-related disorders such as gastroesophageal reflux disease (GERD), peptic ulcers, and Zollinger-Ellison syndrome. It functions as a proton pump inhibitor (PPI), reducing gastric acid secretion by irreversibly blocking the H+/K+-ATPase enzyme system in the parietal cells of the stomach lining. Its structure allows for targeted and prolonged inhibition of acid production, making it effective in both short-term healing and long-term management of acid-mediated conditions. Often formulated in enteric-coated tablets or capsules to ensure stability and proper absorption in the intestine.