Past and present history: Screening,Randomization Drug history: Screening,Week 8/End of treatment, Monitoring After 28 days Physical examination: Screening,Randomization,Week 8/End of treatment, Monitoring After 28 days Height, weight measurement: Screening,Week 8/End of treatment, Monitoring After 28 days Survey against the GERD-Q scale (values of 7 scores): Screening,Week 8/End of treatment Distribution of diaries:Randomization Esophagogastroduodenoscopy: Screening,Week 8/End of treatment Pregnancy test: Screening Distribution of preparation:Randomization Recording of adverse events:Week 8/End of treatment, Monitoring After 28 days Compliance assessment:Week 8/End of treatment