Phase 2 Clinical Trial to Investigate the Safety, Tolerability and Efficacy of YH1885L in Patients With Non-erosive Reflux Disease(NERD)

Inclusion Criteria: * subjects who signed written informed consent form * more than 20 yr subject * subjects who agree the use of medically accepted birth control during trial * grade N, M by EGD test * subject who experience 2 day out of 1 week during recent 1 month * subject who experience 2 day out of 1 week during run-in period Exclusion Criteria: * subjects who can write the diary by himself, herself * pregnant woman, breastfeeding woman * allgeric or intolerabiliy to revaprazan or esomeprazole * feeling of heavy stomach, distention * surgery history in stomach or esophagus * active medical history of stomach, esophagus area * other system disorder which can disturb this trial * Hep B, C virus, HIV carrier or patients * past history of malignant tumor * any psychiatric past or current history * abnormal lab test * abnormal ecg test * zollinger-ellison disease * current or past history of substance, drug abuse * subject who should regulary takes medication which can disturb this trial