Amoxicillin + Levofloxacin + Omeprazole + Tinidazole

This is a combination therapy specifically mentioned for the eradication of **Helicobacter pylori (H. pylori)** infection. It consists of three antibiotics (amoxicillin, levofloxacin, and tinidazole) and a proton pump inhibitor (omeprazole). **Amoxicillin** is a beta-lactam antibiotic that works by inhibiting bacterial cell wall synthesis. **Levofloxacin** is a fluoroquinolone antibiotic that inhibits bacterial DNA topoisomerase II, effective against various bacteria including H. pylori. **Omeprazole** is a proton pump inhibitor that reduces stomach acid production. **Tinidazole** is a nitroimidazole antibiotic, similar to metronidazole. This combination is typically used in a **sequential therapy** regimen for H. pylori. One described regimen involves administering omeprazole and amoxicillin for the first 5 days, followed by omeprazole, levofloxacin, and tinidazole for the next 5 days. Studies mentioned in the search results indicate high eradication rates with this approach, potentially higher than clarithromycin-containing sequential therapies.