This study plans to enroll 100 patients with symptoms of GERD (acid regurgitation, belching, dysphagia). After receiving endoscopic examination, a frequent scale for the symptoms of gastroesophageal reflux disease (FSSG) is obtained from these patients. Fifty patients receive lansoprazole 30 mg once plus mosapride 5 mg tid daily in the first month; and lansoprazole 30 mg once plus placebo tid daily in the second month. Another fifty patients receive lansoprazole 30 mg once plus placebo tid daily in the first month; and lansoprazole 30 mg once plus mosapride 5 mg tid daily in the second month.