Clinical Trial for the Comparative Evaluation of Acid Suppression and Symptom Management of Gastroesophageal Reflux Disease With the Administration of Tegoprazan or Pantoprazole

Inclusion Criteria: * With endoscopic diagnosis of GERD or NERD (endoscopy ≤ 15 days old) * With positive impedance pHmetry results (pHmetry ≤ 15 days old) * With recurrent symptoms of heartburn and regurgitation for a previous period ≥ 3 months old Exclusion Criteria: * With known hypersensitivity to tegoprazan, pantoprazole, or any of the components of each formulation * Subjects with concomitant administration of atazanavir, nelfinavir or rilpivirine * Nephropathic and/or hepatopathic subjects (including non-alcoholic hepatitis) * Subjects with upper gastrointestinal tract bleeding * Subjects with gastric and/or duodenal ulcer 2 months prior to screening * Subjects with a history of esophageal or gastric surgery