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A phase III, randomized, open-label, superiority study comparing the incremental product esomeprazole associated with sodium bicarbonate made by Eurofarma and Nexium® in the treatment of gastroesophageal reflux disease. The study will enroll 94 patients in each arm (total of 188 patients).

Inclusion Criteria:

ICF signing;

• Age ≥ 18 years;
• Gastroesophageal reflux disease diagnosis;
• Grade 0 to grade III reflux esophagitis, assessed by means of upper gastrointestinal endoscopy;
• Ability to have the endoscopy, pH-metry and esophageal manometry examinations performed;
• Washout period of 1 week without using PPI, H2 antagonists and prokinetic agents and of at least 1 day without using antacids.

Exclusion Criteria:

• Presence of esophagitis requiring intervention (grade IV), esophageal varices, Barrett's esophagus, systemic sclerosis or ulcers (gastric or duodenal ulcers);
• Previous gastric or esophageal surgery;
• Dietary sodium restriction, metabolic alkalosis, hypokalemia, Barter syndrome; Pregnancy or breastfeeding;
• Concomitant diseases, such as kidney, liver and heart failure;
• Suspected or confirmed cancer of any type;
• Abusive drug or alcohol use;
• Abnormal values for white blood cells, platelets or hemoglobin;
• Significant changes in serum sodium, potassium, calcium or creatinine concentrations;
• Treatment with PPI, H2 antagonists or prokinetic agents that may not be withheld during the washout period of 1 week or during the study;
• Intolerance or allergy to any of the components in the drug products assessed in the study;
• Use of nonsteroidal anti-inflammatory drugs (NSAIDs), antiemetic agents, macrolide antibiotics and systemic corticoids for a period equal to or greater than 2 weeks before the study or that is expected to require prolonged use during study treatment;
• Concomitant use or requirement of a gastric pH-dependent medication for optimal absorption;
• Scheduled use of other medications metabolized by cytochrome CYP during the study;
• History of active peptic ulcer;
• Rare hereditary problems of fructose intolerance, glucose-galactose malabsorption or sucrose-isomaltase insufficiency;
• Recent participation (within the last 12 months) in another clinical study.