A 40-year-old woman with a duodenal ulcer is confirmed H. pylori positive. Her region has documented clarithromycin resistance exceeding 20 percent. She has no penicillin allergy. Which first-line regimen is recommended?
- A Bismuth-containing quadruple therapy for 14 days ✓
- B Clarithromycin-based triple therapy for 14 days
- C Levofloxacin-based triple therapy for 7 days
- D Dual therapy with amoxicillin and high-dose amoxicillin
Correct answer: A. Bismuth-containing quadruple therapy for 14 days
Explanation
Where clarithromycin resistance exceeds 15 percent, guidelines recommend bismuth quadruple therapy (PPI, bismuth, tetracycline, metronidazole) for 14 days as first-line, because its efficacy is unaffected by clarithromycin resistance. Clarithromycin triple therapy fails in resistant strains. Levofloxacin regimens are reserved for salvage therapy due to resistance and toxicity concerns, and dual amoxicillin therapy is not a standard regimen.
Reference: Katzung's Basic and Clinical Pharmacology, 16th ed.
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