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Clarithromycin, Amoxicillin, and Metronidazole Based Regimens to Treat Helicobacter Pylori Infections in Colombia

This study has been completed.
Universidad del Valle, Colombia
Vanderbilt University
Information provided by:
University of North Texas Health Science Center Identifier:
First received: July 11, 2008
Last updated: July 18, 2008
Last verified: July 2008
More than half of the world's population is infected with Helicobacter pylori, a bacterium that colonizes the human stomach. Although most infected subjects live free of symptoms and disease outcomes (except superficial gastritis), only a few develop peptic ulcers or gastric cancer, while some others may develop non-ulcer dyspepsia. Current clinical practice for the management of peptic ulcer disease includes testing for and treating H. pylori, if present. Although there are triple therapies that contain 2 antibiotics plus a bismuth compound, a proton-pump inhibitor, or a H2-receptor antagonist which are effective at eliminating H. pylori in Europe and North America, these treatments are dramatically less effective in developing countries. Our recent meta-analysis showed quadruple therapies containing clarithromycin, amoxicillin, metronidazole and a proton pump inhibitor to be effective in the presence of clarithromycin or metronidazole resistance. However, this regimen has yet to be tested in a developing country. Therefore, in the current randomized clinical trial in Pasto, Colombia, we aim to examine the effectiveness of clarithromycin, amoxicillin, metronidazole with and without a proton pump inhibitor compared to the Food and Drug Administration approved 10-day regimen containing clarithromycin, amoxicillin and omeprazole. Since antibiotic therapy is most effective within a specific gastric pH range, and since mutifocal atrophy results in damage and loss of the acid producing parietal cells, we will test the efficacy of our modified therapy stratified by diagnosis of multifocal atrophic gastritis.

Condition Intervention Phase
Helicobacter Pylori Infection
Drug: Clarithromycin, Metronidazole, Amoxicillin (+Omeprazole)
Drug: Clarithromycin, Amoxicillin, Omeprazole
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Randomized Clinical Trial to Examine the Efficacy of a Clarithromycin-, Amoxicillin-, and Metronidazole-Based Regimen to Eradicate Helicobacter Pylori Infections in Pasto, Colombia

Resource links provided by NLM:

Further study details as provided by University of North Texas Health Science Center:

Primary Outcome Measures:
  • Helicobacter pylori eradication determined by 13C-urea breath test. [ Time Frame: 4-6 weeks following the completion of treatment ]

Secondary Outcome Measures:
  • Dyspeptic symptom resolution ascertained by self-report. [ Time Frame: 4-6 weeks following the completion of treatment ]

Enrollment: 151
Study Start Date: April 2006
Study Completion Date: February 2007
Primary Completion Date: February 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Clarithromycin 500 mg bid, metronidazole 500 mg tid, and amoxicillin 500mg tid for 14 days (with or without omeprazole 20 mg bid)
Drug: Clarithromycin, Metronidazole, Amoxicillin (+Omeprazole)
Clarithromycin 500 mg bid, metronidazole 500 mg tid, and amoxicillin 500mg tid with or without omeprazole 20 mg bid for 14 days
Other Name: Biaxin, Flagyl, Amoxil, Prilosec
Active Comparator: 2
Clarithromycin 500 mg bid, amoxicillin 1 g bid, and omeprazole 20 mg bid for 10 days
Drug: Clarithromycin, Amoxicillin, Omeprazole
Clarithromycin 500 mg bid, amoxicillin 1 g bid, and omeprazole 20 mg bid for 10 days
Other Name: Biaxin, Amoxil, Prilosec

  Show Detailed Description


Ages Eligible for Study:   29 Years to 77 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Aged 29-77 years; have lived in Pasto, Colombia for at least 5 years and plan to remain in Pasto for ≥5 more years;
  • Currently have Helicobacter pylori infection;
  • Willing to refrain from alcohol consumption for 2 weeks;
  • Have never taken a therapy to eradicate Helicobacter pylori;
  • Have not taken antibiotics, bismuth compounds, proton-pump inhibitors, H2-receptor antagonists, or antacids within 30 days of the trial;
  • Are not pregnant, and have little or no risk of pregnancy.

Exclusion Criteria:

  • History of kidney, liver, heart, or mental disease;
  • Frequent alcohol consumption;
  • Allergic to clarithromycin, amoxicillin, penicillin, omeprazole or metronidazole;
  • Currently taking drugs which may interact with any of the trial medications.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00719420

Universidad del Valle
Cali, Colombia
Sponsors and Collaborators
University of North Texas Health Science Center
Universidad del Valle, Colombia
Vanderbilt University
Principal Investigator: Lori A Fischbach, PhD, MPH University of North Texas Health Science Center
Study Chair: Pelayo Correa, MD Vanderbilt University
Study Director: Luis E Bravo, MD Universidad del Valle
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Dr. Lori A. Fischbach, University of North Texas Health Science Center Identifier: NCT00719420     History of Changes
Other Study ID Numbers: 06-02-24-2
Study First Received: July 11, 2008
Last Updated: July 18, 2008

Keywords provided by University of North Texas Health Science Center:
Randomized clinical trial
Helicobacter pylori
proton pump inhibitor

Additional relevant MeSH terms:
Communicable Diseases
Helicobacter Infections
Gram-Negative Bacterial Infections
Bacterial Infections
Anti-Ulcer Agents
Gastrointestinal Agents
Proton Pump Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Anti-Bacterial Agents
Anti-Infective Agents
Protein Synthesis Inhibitors
Cytochrome P-450 CYP3A Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Antiprotozoal Agents
Antiparasitic Agents processed this record on May 22, 2017