To evaluate the safety and tolerability of single and multiple ascending oral doses of DWP14012 in healthy Japanese, Caucasian and Korean subjects

Inclusion Criteria:

• Healthy adult Caucasian or Japanese or Korean aged 19 to 50 (inclusive) years, at the time of screening.
• Subjects weighing between 50 kg and 90 kg with BMI between 18 and 27 kg/m2 (inclusive) at screening visit.

Exclusion Criteria:

• Those who have clinical significant liver, kidney, nervous system, respiratory, endocrine, hematology and oncology, cardiovascular, urinary, and mental diseases or past history
• Those who have gastrointestinal diseases or past history of gastrointestinal diseases (gastrointestinal ulcer, gastritis, gastrospasm, gastroesophageal reflux, Crohn's disease etc.) that may affect safety and pharmacokinetic/pharmacodynamic evaluation of study drug, and those who have past history of gastrointestinal surgery (however, except simple appendectomy and herniotomy)
• Those who have been Helicobacter pylori positive
• Those whose plasma AST (SGOT) and ALT (SGPT) exceed 1.5 times to the upper limit of the normal range in screening including additional examinations prior to randomization
• Those who have anatomical disability in insertion and maintenance of pH meter catheter