A 52-year-old man with a 10-year history of duodenal ulcer disease presents with epigastric pain and heartburn. Upper endoscopy confirms an active duodenal ulcer. He is H. pylori-positive on rapid urease test. What is the drug of choice for initial eradication therapy in this patient?

Question

Accepted Answer

A. Omeprazole + amoxicillin + clarithromycin. ## H. pylori Eradication Therapy in Peptic Ulcer Disease

**Key Point:** Triple therapy combining a proton pump inhibitor (PPI) with two antibiotics is the gold-standard first-line regimen for H. pylori eradication in peptic ulcer disease.

### Standard Triple Therapy Regimen

**High-Yield:** The most widely recommended and effective triple therapy consists of:
- **Proton pump inhibitor** (omeprazole, lansoprazole, or pantoprazole)
- **Amoxicillin** (or metronidazole if penicillin-allergic)
- **Clarithromycin** (or metronidazole as alternative)

This combination achieves eradication rates of 85–95% when compliance is maintained.

### Mechanism of Action

| Component | Role | Mechanism |
|-----------|------|----------|
| PPI (Omeprazole) | Acid suppression | Inhibits H^+^/K^+^-ATPase; creates alkaline environment for antibiotic penetration |
| Amoxicillin | Bactericidal antibiotic | β-lactam; disrupts bacterial cell wall |
| Clarithromycin | Bactericidal antibiotic | Macrolide; inhibits bacterial protein synthesis |

**Clinical Pearl:** The PPI is essential not only for symptom relief but also to reduce gastric acidity, which enhances antibiotic bioavailability and H. pylori susceptibility.

### Duration and Compliance

**Key Point:** Standard triple therapy is administered for **7–14 days** (typically 10 days in India). Compliance is critical—incomplete courses lead to antibiotic resistance and treatment failure.

### Why This Regimen Works

1. **Synergistic effect:** The combination targets H. pylori through multiple mechanisms simultaneously.
2. **Resistance prevention:** Dual antibiotic coverage reduces the likelihood of resistance emergence.
3. **Acid suppression:** PPI-induced hypochlorhydria creates an optimal milieu for antibiotic penetration into gastric mucosa.

**Mnemonic:** **PAC** = **P**roton pump inhibitor + **A**moxicillin + **C**larithromycin

[cite:Harrison 21e Ch 297]

Answer

B. Ranitidine + bismuth subsalicylate

Answer

C. Omeprazole monotherapy

Answer

D. Sucralfate + metronidazole

A 52-year-old man with a 10-year history of duodenal ulcer disease presents with epigastric pain and heartburn. Upper endoscopy confirms an active duodenal ulcer. He is H. pylori-positive on rapid urease test. What is the drug of choice for initial eradication therapy in this patient?

Explanation

H. pylori Eradication Therapy in Peptic Ulcer Disease

Standard Triple Therapy Regimen

Mechanism of Action

Duration and Compliance

Why This Regimen Works

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Component	Role	Mechanism
PPI (Omeprazole)	Acid suppression	Inhibits H⁺/K⁺-ATPase; creates alkaline environment for antibiotic penetration
Amoxicillin	Bactericidal antibiotic	β-lactam; disrupts bacterial cell wall
Clarithromycin	Bactericidal antibiotic	Macrolide; inhibits bacterial protein synthesis