Esomeprazole magnesium dihydrate is primarily used to study gastric acid secretion. The compound acts as a proton pump inhibitor and inhibits the H+/K+ ATPase enzyme system on the secretory surface of gastric parietal cells. It is also used in studies to understand the mechanisms of acid-related diseases and conditions. In addition, researchers have found that Esomeprazole magnesium affects the pH of the stomach, which in turn affects the stomach's absorption of certain substances.