title: Twice a day quadruple therapy (bismuth subsalicylate, tetracycline, metronidazole plus lansoprazole) for treatment of Helicobacter pylori infection.
abstract: BACKGROUND
  Quadruple therapy (bismuth, metronidazole and tetracycline (BMT) + proton pump inhibitor) is touted as being > 95% effective, regardless of metronidazole resistance. We tested a 10-day b.d. quadruple therapy for treatment of H. pylori infection.
  
  
  METHODS
  Anti-H. pylori therapy consisted of lansoprazole 15 mg b.d. plus tetracycline 500 mg b.d., metronidazole 500 mg b.d., and swallowable Pepto-Bismol caplets (2 b.d.) for 10 days. H. pylori status was evaluated by culture and histology before and 4 or more weeks after therapy.
  
  
  RESULTS
  The cure rate for intention-to-treat was 70%. Treatment success was calculated overall and separately in relation to antimicrobial resistance patterns. The cure rate among the metronidazole-sensitive isolates was 89.7% (26 of 29) vs. 41.2% (7 of 17) of the metronidazole-resistant isolates (P < 0.005). Moderate (n = 1) or severe (n = 3) side-effects were experienced in four patients with only one withdrawing because of side-effects.
  
  
  CONCLUSIONS
  Twice a day quadruple therapy is effective for metronidazole-sensitive strains but its usefulness is markedly reduced by the presence of pre-treatment metronidazole resistance. Twice a day quadruple therapy can be recommended in locations where background metronidazole resistance is uncommon. Possibly, 14-day therapy or a higher dosage of metronidazole provide better results with metronidazole-resistant H. pylori.
authors.affiliation: Department of Medicine, Veterans Affairs Medical Center, Houston, Texas 77030, USA.
authors.forename: D Y
authors.initials: DY
authors.lastname: Graham
authors.forename: J
authors.initials: J
authors.lastname: Hoffman
authors.forename: H M
authors.initials: HM
authors.lastname: el-Zimaity
authors.forename: D P
authors.initials: DP
authors.lastname: Graham
authors.forename: M
authors.initials: M
authors.lastname: Osato
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001729:Bismuth / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D064747:Lansoprazole; D008297:Male; D008795:Metronidazole / Q000627:therapeutic use*; D008875:Middle Aged; D009853:Omeprazole / Q000031:analogs & derivatives* / Q000627:therapeutic use; D009942:Organometallic Compounds / Q000627:therapeutic use*; D054328:Proton Pump Inhibitors; D012459:Salicylates / Q000627:therapeutic use*; D012907:Smoking; D013752:Tetracycline / Q000627:therapeutic use*; D013754:Tetracyclines / Q000627:therapeutic use*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D009942:Organometallic Compounds; D054328:Proton Pump Inhibitors; D012459:Salicylates; D013754:Tetracyclines; D064747:Lansoprazole; D008795:Metronidazole; C015715:bismuth subsalicylate; D013752:Tetracycline; D009853:Omeprazole; D001729:Bismuth