title: Efficacy and optimum dose of omeprazole in a new 1-week triple therapy regimen to eradicate Helicobacter pylori.
abstract: OBJECTIVE
  To assess the efficacy of a 1-week course of omeprazole, clarithromycin and tinidazole for the eradication of Helicobacter pylori and the optimum dose of omeprazole required.
  
  
  METHODS
  The study was divided into two sequential phases. The first phase was an open, two-centre study. The second phase was a single-blind, single-centre study.
  
  
  METHODS
  Patients found to be infected with H. pylori at endoscopy were enrolled in the study. In phase 1, patients were prescribed 20 mg omeprazole, 250 mg clarithromycin and 500 mg tinidazole twice daily for 1 week. In phase 2, all patients were prescribed 250 mg clarithromycin and 500 mg tinidazole twice daily for 1 week. In addition, patients were randomly assigned to receive 20 mg omeprazole twice daily (group A), 20 mg omeprazole daily (group B) or no omeprazole (group C). Eradication was assessed in all patients by 13C-urea breath testing 4 weeks after the completion of therapy.
  
  
  RESULTS
  In phase 1, H. pylori eradication was achieved in 132 (88%) of 150 evaluable patients. In phase 2, eradication was achieved in 44 (88%) of 50 individuals in group A, 47 (88.7%) of 53 in group B and 30 (63.8%) of 47 in group C. In the omeprazole groups, 22 patients harboured metronidazole-resistant strains of H. pylori and all were cured by the omeprazole regimen. One patient harboured a strain of H. pylori that was resistant to clarithromycin alone but which was successfully eradicated. Treatment failed in two out of three patients harbouring H. pylori strains resistant to both clarithromycin and tinidazole.
  
  
  CONCLUSIONS
  One week of omeprazole, clarithromycin and tinidazole is effective in eradicating H. pylori. There is no advantage in increasing the dose of omeprazole from once to twice daily. This regimen is effective in patients with 5-nitroimidazole-resistant strains of H. pylori.
authors.affiliation: Centre for Digestive Diseases, Leeds General Infirmary, UK.
authors.forename: P
authors.initials: P
authors.lastname: Moayyedi
authors.forename: P
authors.initials: P
authors.lastname: Sahay
authors.forename: D S
authors.initials: DS
authors.lastname: Tompkins
authors.forename: A T
authors.initials: AT
authors.lastname: Axon
mesh_terms: D000328:Adult; D000368:Aged; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D001706:Biopsy; D017291:Clarithromycin / Q000008:administration & dosage / Q000627:therapeutic use; D004352:Drug Resistance, Microbial; D004359:Drug Therapy, Combination; D016099:Endoscopy, Gastrointestinal; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy* / Q000382:microbiology / Q000473:pathology; D016480:Helicobacter pylori / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage* / Q000627:therapeutic use; D010437:Peptic Ulcer / Q000188:drug therapy* / Q000382:microbiology / Q000473:pathology; D016037:Single-Blind Method; D014011:Tinidazole / Q000008:administration & dosage / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D014011:Tinidazole; D017291:Clarithromycin; D009853:Omeprazole