All children from 1day to 18years of age, diagnosed with peptic ulcer disease due to H pylori at Pakistan Institute of Medical Sciences, Islamabad, from July 2020 to December 2021 will be included in the study. After informed written consent from parents/ guardians patients' bio data along with history and examination will be recorded on a proforma. They will be allocated into two groups, group A and group B randomly based on treatment regimen offered.

Group A: Amoxicillin AMO + Clarithromycin CLA + Proton pump inhibitor PPI) Group B: Amoxicillin AMO+ Metronidazole MET+ Proton pump inhibitor PPI The history will include presenting symptoms along duration, remission of symptoms after therapy and clinical outcome will also be recorded.

Helicobacter pylori is a gram-negative bacillus responsible for one of the most common infections found in humans worldwide1. In general, the prevalence is high in developing countries and the infection is acquired at a young age. Most children infected with H pylori are asymptomatic. Antral gastritis is the most common manifestation in children. Duodenal and gastric ulcers may be associated with H pylori gastritis in 1.8 % children2. Antibiotic resistance is the major cause of failure in the treatment of H pylori infection3. Most of the studies worldwide confirmed an increase in macrolide resistance, while metronidazole resistance either decreased or remained stable. In a prospective multicenter European study, primarily comprised of adults, found a 31.8% resistance rate to clarithromycin and 25.7% to metronidazole in the study4.

If the strain is resistant to one of the antibiotics used, treatment success will be compromised5. As a result therapies that are recommended should be based on antibiotic susceptibility testing. If this testing is not available, then clarithromycin-based triple therapy should not be used as part of first-line therapy due to high rates of clarithromycin resistance rates6 The European Society for Paeditric Gastroenterology Hepatology and Nutrition/North American Society for Pediatric Gastroenterology, Hepatology and Nutrition made the recommendations in 2017 for the Management of Helicobacter pylori in Children that antimicrobial sensitivity should be obtained for the infecting H pylori to tailor eradication therapy accordingly and the effectiveness of first-line therapy should be evaluated in national/regional centers7.

If the strain is susceptible to clarithromycin (CLA) and to metronidazole (MET), triple therapy (PPI, amoxicillin [AMO], CLA) for 14 days and doses of proton pump inhibitor and antibiotics should be calculated based on the bodyweight8.

We aim to study efficacy and safety of clarithromycin vs metronidazole based triple regimen for the eradication of H pylori in children with peptic ulcer disease.

Inclusion Criteria:

• 1. All children age 1-12 years having H-pylori gastritis

Exclusion Criteria:

• drug induced gastritis critically ill child

SPSS DATA SHEETS WILL BE SHARED

6 months after publication for further 6 months

through email on demand