The article compares vonoprazan and lansoprazole in terms of treatment efficiency on duodenal and gastric ulcers, based on published studies by Hiroto Miwa in the January 2017 issue of the journal "Alimentary Pharmacology and Therapeutics." Topics discussed include the treatment study on duodenal ulcer was done in 76 sites in Japan from October 2011 to February 2013, the gastric ulcer study was done in 83 sites, and results proved vonoprazan as a superior treatment for both ulcers.