title: Adjuvant effect of vitamin C on omeprazole-amoxicillin-clarithromycin triple therapy for Helicobacter pylori eradication.
abstract: OBJECTIVE
  To test the impact of vitamin C supplementation on triple therapy for H. pylori eradication.
  
  
  METHODS
  A total of 171 H. pylori-infected patients were randomized to receive different one-week triple therapies, including 20 mg omeprazole, 1 g amoxicillin, plus the following twice daily: (1) 250 mg clarithromycin (C250 group, n=55); (2) 250 mg clarithromycin and 500 mg vitamin C (V-C250 group, n=61); (3) 500 mg clarithromycin (C500 group, n=55). Six weeks after treatment, the success of H. pylori eradication was assessed by a 13C-urea breath test. Each collected H. pylori strain was defined as either clarithromycin susceptible or resistant by E-test.
  
  
  RESULTS
  The demographic background, clarithromycin susceptibility of H. pylori, and drug compliance were similar among the three groups (p=NS). For clarithromycin susceptible infection, the V-C250 group had a higher eradication rate than the C250 group (ITT: 85% vs. 68% and PP: 90% vs. 73%, p = 0.03), but had an equivalent rate to the C500 group (p=NS). For clarithromycin resistant infection, all three groups had a similarly poor eradication rate of less than 34%.
  
  
  CONCLUSIONS
  Adding vitamin C to one-week triple therapy can reduce the dosage of clarithromycin, but preserve the high eradication efficacy for clarithromycin susceptible H. pylori infection.
authors.affiliation: Department of Internal Medicine, Medical College, National Cheng Kung University, Tainan, Taiwan.
authors.forename: Chiao-Hsiung
authors.initials: CH
authors.lastname: Chuang
authors.forename: Bor-Shyang
authors.initials: BS
authors.lastname: Sheu
authors.forename: Ai-Wen
authors.initials: AW
authors.lastname: Kao
authors.forename: Hsiu-Chi
authors.initials: HC
authors.lastname: Cheng
authors.forename: Ay-Huey
authors.initials: AH
authors.lastname: Huang
authors.forename: Hsiao-Bai
authors.initials: HB
authors.lastname: Yang
authors.forename: Jiunn-Jong
authors.initials: JJ
authors.lastname: Wu
mesh_terms: D000328:Adult; D000658:Amoxicillin / Q000008:administration & dosage / Q000627:therapeutic use*; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D000897:Anti-Ulcer Agents / Q000008:administration & dosage / Q000627:therapeutic use; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000627:therapeutic use*; D017291:Clarithromycin / Q000008:administration & dosage / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D004381:Duodenal Ulcer / Q000175:diagnosis / Q000188:drug therapy / Q000382:microbiology; D016099:Endoscopy, Gastrointestinal; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage / Q000627:therapeutic use*; D054328:Proton Pump Inhibitors; D013276:Stomach Ulcer / Q000175:diagnosis / Q000188:drug therapy / Q000382:microbiology
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D054328:Proton Pump Inhibitors; D000658:Amoxicillin; D017291:Clarithromycin; D009853:Omeprazole; D001205:Ascorbic Acid