Efficacy and Safety of Dexlansoprazole MR and Lansoprazole on Healing of Erosive Esophagitis

Inclusion Criteria: * Subject must have endoscopically confirmed erosive esophagitis as defined by the Los Angeles (LA) Classification Grading System (A-D). Exclusion Criteria: * Subject has a positive Campylobacter-like organisms (CLO) test for Helicobacter (H.) pylori. * Use of prescription or non-prescription proton pump inhibitors (PPIs), histamine (H2) receptor antagonists or sucralfate, drugs with significant anticholinergic effects, misoprostol or prokinetics * Use of antacids \[except for study supplied Gelusil®\] * Need for continuous anticoagulant therapy (Blood Thinners) * Endoscopic Barrett's esophagus and/or definite dysplastic changes in the esophagus * History of dilatation of esophageal strictures, other than Schatzki's ring (a ring of mucosal tissue near the lower esophageal sphincter) * Current or historical evidence of Zollinger-Ellison syndrome or other hypersecretory condition * History of gastric, duodenal or esophageal surgery except simple oversew of an ulcer * Acute upper gastrointestinal (UGI) hemorrhage within 4 weeks of the Screening endoscopy