Used in pharmaceutical formulations as a proton pump inhibitor to reduce gastric acid production. It is employed in the treatment of gastroesophageal reflux disease (GERD), peptic ulcers, Zollinger-Ellison syndrome, and in combination with antibiotics for Helicobacter pylori eradication to promote ulcer healing and prevent recurrence. The sodium salt form enhances solubility, making it suitable for intravenous administration in patients who cannot take oral medication. It works by irreversibly blocking the H+/K+ ATPase enzyme system in the gastric parietal cells, thereby inhibiting acid secretion. Commonly found in injectable preparations for hospital or clinical use when rapid acid suppression is needed, such as in cases of upper gastrointestinal bleeding.