Intravenous (IV) infusion produces a faster and steadier acid suppression than an oral regimen. Furthermore, some patients with severe erosive esophagitis cannot take pills by mouth and will benefit from an IV formulation. Recently, we observed healing of severe erosive esophagitis with continuous IV pantoprazole in several patients in 3 days. The safety of IV pantoprazole has been demonstrated in patients with GERD, with Zollinger-Ellison syndrome, or bleeding ulcer. This study is to define the safety and efficacy of continuous IV pantoprazole in the treatment of severe erosive esophagitis.