What is the recommended treatment for chronic gastritis, including medication regimens and lifestyle modifications?

Chronic Gastritis Treatment

For H. pylori-positive chronic gastritis, use bismuth quadruple therapy (PPI + bismuth + metronidazole + tetracycline) for 14 days as first-line treatment; for H. pylori-negative gastritis, use PPIs or H2RAs for symptom control and mucosal healing. 1

H. pylori-Positive Gastritis (Most Common)

First-Line Treatment Options

The treatment paradigm has shifted away from clarithromycin-based triple therapy due to rising antibiotic resistance. Bismuth quadruple therapy is now the preferred first-line regimen because it maintains efficacy even with metronidazole-resistant strains and avoids overuse of antibiotics in the "Watch" category 1, 2.

Recommended first-line regimens (choose one):

1. Bismuth Quadruple Therapy (preferred):

   • PPI (standard dose) twice daily
   • Bismuth subsalicylate 262 mg, 2 tablets four times daily (or equivalent formulation)
   • Metronidazole 500 mg three to four times daily
   • Tetracycline 500 mg four times daily
   • Duration: 14 days 1

2. Concomitant Non-Bismuth Quadruple Therapy (when bismuth unavailable):

   • PPI twice daily
   • Amoxicillin 1000 mg twice daily
   • Clarithromycin 500 mg twice daily
   • Metronidazole 500 mg twice daily
   • Duration: 14 days 1

Critical caveat: Use concomitant therapy only in areas with low clarithromycin resistance (<15%). The 14-day duration is superior to 10-day regimens across all guidelines 1.

Penicillin Allergy

If true penicillin allergy exists, bismuth quadruple therapy remains the preferred option since it contains tetracycline, not penicillin 1.

Second-Line Treatment (After First Failure)

Never reuse clarithromycin or levofloxacin if previously failed - resistance develops rapidly after exposure 1.

Choose based on first-line regimen:

• If bismuth quadruple failed → Levofloxacin triple therapy:

  • PPI twice daily
  • Amoxicillin 1000 mg twice daily
  • Levofloxacin 500 mg once daily
  • Duration: 14 days 1

• If concomitant therapy failed → Bismuth quadruple therapy (as above) 1

Third-Line and Beyond

• High-dose dual therapy: Rabeprazole 20 mg four times daily + Amoxicillin 750 mg four times daily for 14 days 1
• Rifabutin triple therapy: PPI twice daily + Amoxicillin 1000 mg twice daily + Rifabutin 150 mg twice daily for 10 days (reserve for third/fourth-line) 1

Confirmation of Eradication

Perform 13C urea breath test at least 4 weeks after completing therapy to confirm eradication 3. This is essential as treatment failure is common.

H. pylori-Negative Chronic Gastritis

Acid Suppression Therapy

For symptomatic patients without H. pylori:

First-line options:

• PPIs: Omeprazole 20 mg, esomeprazole 20 mg, lansoprazole 30 mg, or pantoprazole 40 mg once daily 4
• H2RAs: Famotidine 20 mg daily effectively reduces symptoms and improves quality of life 4, 5
• P-CABs (newer option): Potassium-competitive acid blockers provide rapid symptom relief 4

Duration: Typically 4-8 weeks for symptom control and mucosal healing 5.

Mucoprotective Agents

Consider adding agents that enhance gastric mucosal protection:

• Promote mucosal regeneration
• Reduce inflammation
• Mitigate oxidative stress
• Clinical trials show effectiveness in endoscopic healing 4

Special Considerations

Chronic Atrophic Gastritis (CAG)

H. pylori eradication may contribute to regression of CAG, though reversibility remains controversial 6. Patients with advanced CAG require:

• High-quality endoscopy every 3 years
• Surveillance for gastric cancer risk
• Eradication therapy is still recommended despite uncertainty about complete reversal 6

Antimicrobial Stewardship

The classification matters for public health:

• "Access group" antibiotics (amoxicillin, tetracycline, metronidazole): Lower resistance potential, preferred
• "Watch group" antibiotics (clarithromycin, levofloxacin): Higher resistance potential, use judiciously 2

This is why bismuth quadruple therapy with tetracycline and metronidazole is particularly appropriate for mass eradication programs 2.

Common Pitfalls to Avoid

1. Do not use 7-10 day triple therapy with clarithromycin - success rates have declined dramatically due to resistance 1
2. Do not skip confirmation testing - assume eradication was successful without verification leads to persistent infection
3. Do not reuse failed antibiotics - particularly clarithromycin and levofloxacin where resistance is common after exposure 1
4. Do not use sequential or hybrid therapies as first-line - they are considered non-ideal options 1