A patient with peptic ulcer disease does not smoke and drinks wine infrequently with meals. Which regimen is appropriate?

• A. Amoxicillin, clarithromycin, and omeprazole
• B. Metronidazole, tetracycline, and omeprazole
• C. Amoxicillin, metronidazole, and famotidine
• D. Clarithromycin, metronidazole, and sucralfate

Answer: (A)

Treating H. pylori–associated peptic ulcer disease with a proton pump inhibitor–based triple therapy is the standard approach. The PPI creates a less acidic environment that helps antibiotics work better and promotes ulcer healing. Amoxicillin and clarithromycin attack the bacteria in complementary ways—amoxicillin disrupts cell wall synthesis, while clarithromycin inhibits protein synthesis—leading to effective eradication when clarithromycin resistance is not high in the area.

This regimen—amoxicillin, clarithromycin, and a PPI (such as omeprazole)—is preferred because it combines a strong acid-suppressing agent with two antibiotics that have good activity against H. pylori, yielding high eradication rates in appropriate settings.

Regimens that swap in an H2 blocker instead of a PPI are less ideal due to weaker acid suppression and lower eradication effectiveness. regimens that omit one of the key antibiotics or rely on agents like sucralfate, which can interfere with antibiotic absorption, are also not first-line choices. Additionally, metronidazole-containing options raise concerns with alcohol use due to potential disulfiram-like reactions, which is another reason this particular combination is preferred for a patient who drinks wine infrequently.