Proton pump inhibitors (PPIs) are weak base drugs with lipophilic structures and can pass through the parietal cell membrane. Since PPIs target the extracytoplasmic luminal area of the proton pump, it must reach the acidic space inside the parietal cell.For this reason, PPIs are administered in the form of a prodrug which is activated in an acidic environment. PPIs are protonated in the acidic environment and bind covalently to the H+/K+-ATPase enzyme, irreversibly inhibiting the acid secretion of the pro-