This document provides information about proton pump inhibitors (PPIs). It discusses what a proton pump is and how PPIs work by inhibiting proton pumps in the stomach. It lists commonly used PPIs like omeprazole, lansoprazole, and pantoprazole. It describes the mechanism of action of PPIs in blocking acid production and their pharmacokinetics. Potential adverse effects with short and long term use are outlined as well as common medical and therapeutic uses to treat conditions like ulcers and GERD. A comparison of pantoprazole to other PPIs in terms of bioavailability, effects duration, and drug interactions is also provided.