This randomized controlled trial is designed to compare the efficacy of standard triple therapy versus bismuth-based quadruple therapy for the eradication of Helicobacter pylori-induced gastritis. The study is being conducted at Shahida Islam Medical College, Lodhran, Pakistan. Adult patients with confirmed H. pylori infection are randomly allocated to receive either a 14-day triple therapy regimen or a 14-day bismuth-based quadruple therapy regimen. Eradication of H. pylori is assessed six weeks after completion of treatment using stool antigen testing. The primary outcome measure is the proportion of patients achieving successful eradication of H. pylori.