anaprazole + amoxicillin + clarithromycin + bismuth

Anaprazole + amoxicillin + clarithromycin + bismuth is a four-drug oral combination designed for the eradication of *Helicobacter pylori* infection, particularly in patients with peptic ulcers or gastritis. Anaprazole is a proton pump inhibitor (PPI) that reduces gastric acid secretion, creating a favorable environment for antibiotic action. Amoxicillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis, while clarithromycin is a macrolide antibiotic that inhibits protein synthesis by binding to 50S ribosomal subunits. Bismuth salts possess antimicrobial effects against *H. pylori* and have mucosal protective properties. Together, this combination targets the eradication of *H. pylori* through multiple, complementary mechanisms and is typically used where resistance to clarithromycin or metronidazole is a concern[1][2].