This is a double-blind, randomized, active-controlled, phase 3 study. Subjects will be randomly assigned to one of the two treatment groups (tegoprazan 25 mg, lansoprazole 15 mg).
This study is designed to confirm the non-inferiority of Tegoprazan 25 mg, compared to Lansoprazole 15 mg, to prevent gastroduodenal ulcers and verify the safety of tegoprazan following oral administration of tegoprazan 25 mg QD or lansoprazole 15 mg QD in patients on long-term treatment with NSAIDs.