Efficacy of Probiotics in the Management of Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis

Irritable bowel syndrome (IBS) significantly impacts quality of life. Probiotics offer relief by modulating gut microbiota, but variability in outcomes necessitates a systematic evaluation of their efficacy. This study aims to evaluate the efficacy of probiotics in improving symptoms of IBS through a systematic review and meta-analysis. A comprehensive search of PubMed and Google Scholar identified studies published between 2014 and 2018. Inclusion criteria focused on randomized controlled trials evaluating probiotics in adult IBS patients diagnosed using standardized criteria. Statistical analysis utilized random effects models to account for heterogeneity, with subgroup analysis performed for IBS subtypes. This review included 23 studies involving 3,288 participants. Probiotics significantly reduced abdominal pain (mean difference = -1.66, 95% CI = -2.39 to -0.93, p < 0.0001) and bloating (mean difference = -2.13, 95% CI = -3.96 to -0.30, p = 0.0224). Improvement in stool habits was significant (mean difference = -1.52, 95% CI = -2.15 to -0.88, p < 0.0001), particularly in diarrhea-predominant IBS. Quality of life improved significantly, with a mean increase of 8.77 points (95% CI = 0.91 to 16.64, p = 0.028). Adverse events were mild and infrequent. However, heterogeneity was high (I² > 90%), reflecting variability in study protocols. Probiotics are effective in reducing IBS symptoms and improving quality of life, mainly in diarrhea-predominant IBS. More research should be conducted that focuses on standardized, long-term trials to refine treatment strategies.