The aim of the study is to evaluate the effect of pantoprazole on the complete remission of GERD. Complete remission is defined as endoscopically confirmed healing and symptom relief after a maximum of 12-week treatment period. Pantoprazole will be administered once daily in the morning. Endoscopy will be performed at the start of the study, and then as required after 4, 8, or 12 weeks. The study will provide further data on safety and tolerability of pantoprazole.