Long term impact of vonoprazan‐based Helicobacter pylori treatment on gut microbiota and its relation to post‐treatment body weight changes

Abstract Background Vonoprazan‐based Helicobacter pylori ( H. pylori ) treatment is highly effective in eradicating the target bacteria; however, its post‐1‐year impact on gut microbiota is unknown. This study evaluated the impact of vonoprazan‐based H. pylori therapy on gut microbiota 1‐year post‐therapy and investigated the relationship between body weight changes and post‐therapy gut microbiota perturbations. Materials and Methods Between March and May 2019, 43 patients with H. pylori infections received either vonoprazan/amoxicillin (VA) or vonoprazan/amoxicillin/clarithromycin (VAC) therapy. Fecal samples were collected prior to treatment and 1 year after treatment. The alpha and beta diversities and the bacterial taxa composition ratios were determined using polymerase chain reaction amplification of the V3–V4 region of the 16S ribosomal RNA gene. The correlation between body weight changes and relative abundances of genera post‐therapy was also analyzed. Results Among the 43 patients, 18 received VA therapy and 21 received VAC therapy. One year after treatment, the alpha diversity was significantly higher in both the treatment groups ( p < .001, using observed operational taxonomic units and Chao1 index), and beta diversity was significantly different in both the groups ( p = .001, using unweighted UniFrac distance) compared with baseline findings. Significant positive correlations were found between body weight changes and the relative abundances of Coprococcus spp. ( p = .037) and Odoribacter spp. ( p = .022) post‐therapy. Conclusion Vonoprazan‐based H. pylori therapies are associated with long‐term impacts on gut microbiota, including effects on bacterial species richness, and potentially affect metabolism by altering the microbiota. Trial registration number: UMIN000040025.