amoxicillin + pantoprazole + clarithromycin + tinidazole

This is a four-drug oral combination therapy consisting of amoxicillin, pantoprazole, clarithromycin, and tinidazole. It is used primarily for the eradication of Helicobacter pylori infection associated with peptic ulcer disease. - **Amoxicillin** is a penicillin-type antibiotic that inhibits bacterial cell wall synthesis, leading to bacterial death. - **Pantoprazole** is a proton pump inhibitor (PPI) that suppresses gastric acid secretion by inhibiting the H+/K+ ATPase enzyme in gastric parietal cells. - **Clarithromycin** is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit. - **Tinidazole** is an antiprotozoal and antibacterial agent from the nitroimidazole class; it works by damaging DNA and inhibiting nucleic acid synthesis in susceptible organisms. This quadruple regimen targets H. pylori through multiple mechanisms—antibiotic action against bacteria (amoxicillin, clarithromycin, tinidazole) and reduction of stomach acidity (pantoprazole), which enhances antibiotic efficacy and promotes ulcer healing[4][5][8].