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Updated: Oct 12, 2026
Quantitative Polymerase Chain Reaction (qPCR)-Based Rapid Diagnosis of Helicobacter pylori Infection and Antibiotic Resistance
Published on: July 28, 2023
Five-day regimens containing ranitidine bismuth citrate plus high-dose clarithromycin and either amoxycillin or
G Cammarota1, O Cannizzaro, V Ojetti
1Department of Internal Medicine and Gastroenterology, Catholic University of Rome, Italy. dora.erasmo@tiscalinet.it
Background:
Ranitidine bismuth citrate (RBC)-based triple therapies for a period of 7 days have proved to be an effective treatment for Helicobacter pylori.
Aim:
To investigate the eradication efficacy, safety profile and patient compliance of two RBC-based triple therapies given for 5 days.
Methods:
Eighty H. pylori-positive patients with dyspeptic symptoms, referred to us for gastroscopy, were consecutively enrolled in this prospective, randomized, open-label study. These patients were randomly assigned to receive a 5-day course of RBC 400 mg b.d. plus clarithromycin 500 mg b.d. and either tinidazole 500 mg b.d. (RBCCT group) or amoxycillin 1 g b.d. (RBCCA group). The H. pylori status was assessed by means of histology and rapid urease test at entry, and by 13C-urea breath test 8 weeks after the completion of treatment.
Results:
All enrolled patients completed the study. Thirty-seven of 40 patients treated with RBCCT (both PP and ITT analysis: 93%; 95% CI: 80-98%) and 35 of 40 in the RBCCA group (both PP and ITT analysis: 88%; 95% CI: 73-96%) returned H. pylori-negative. Slight or mild side-effects occurred in 4/40 patients (10%) in the RBCCT group and in 5/40 (12%) in the RBCCA group.
Conclusions:
This is the first study demonstrating the efficacy of RBC-based triple therapies given for only 5 days. RBC regimens containing high-dose clarithromycin and either amoxycillin or tinidazole prove to be well tolerated, safe and preserve good eradication rates even when administered for a shorter than conventional duration.
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