Esomeprazole Magnesium trihydrate ((S)-Omeprazole magnesium trihydrate) is a proton pump inhibitor indicated for the short-term treatment of gastroesophageal reflux disease in patients with a history of erosive esophagitis.Esomeprazole magnesium trihydrate acts as an exosome inhibitor by blocking the exosome release via the inhibition of V-H+-ATPases