 The drug being tested in this study is called vonoprazan. Vonoprazan is being tested as a maintenance treatment for people with healed erosive esophagitis EE. This study will look at participants in whom endoscopic healing of erosive esophagitis has been confirmed with vonoprazan or adequate treatment with a proton pump inhibitor PPI, to demonstrate the non-inferiority of vonoprazan to Lansoprazole in their maintenance treatment 6 months or 24 weeks as well as to determine the clinically recommended dose for vonoprazan for maintenance therapy in erosive esophagitis. 