The study design is a multi-centre, randomized, double-blind, placebo controlled clinical trial in patients diagnosed with IBS. Diagnosis of IBS with the World Gastroenterology Organisation's IBS questionnaire for health care providers. Assessment of severity of IBS by using the IBS Severity of Symptoms Scale (IBS-SSS). IBS patients with moderate to severe IBS will be included into the study (IBS-SSS ≥ 175). A four weeks screening phase is used to evaluate patients' IBS and their capability to report IBS symptoms using a patient diary. The screening phase is followed by treatment with one capsule per day of a nine-strain synbiotic (Vivatlac® Synbiotikum) or placebo for twelve weeks. Each capsule of Vivatlac® Synbiotikum contains a total of 4.5 x 10˄9 colony forming units (CFU) of nine different probiotic bacteria. Probiotic bacteria strains and their CFU amount per capsule are: Lactococcus lactis Ll-23, 9.00 x 10˄8 CFU; Lactobacillus helveticus SP 27, 9.00 x 10˄8 CFU; Bifidobacterium longum Bl-05, 6.75 x 10˄8 CFU; Bifidobacterium breve Bb-03, 4.50 x 10˄8 CFU; Lacticaseibacillus rhamnosus Lr-32, 4.50 x 10˄8 CFU; Streptococcus thermophiles St-21, 4.50 x 10˄8 CFU; Lacticaseibacillus casei Lc-11, 2.25 x 10˄8 CFU; Lactiplantibacillus plantarum Lp-115, 2.25 x 10˄8 CFU; Bifidobacterium bifidum Bb-02, 2.25 x 10˄8 CFU. Effects will be assessed by using the IBS Severity of Symptoms Scale (IBS-SSS), assessment of changes of IBS severity by using the IBS Global Improvement Scale (IBS-GIS) and assessment of IBS relief by using the IBS Adequate Relief scale (IBS-AR) every four weeks. Additional measures will be stool consistency using the Bristol Stool Scale, number of bowel movements, severity of pain, severity of bloating, stool pressure, feeling of incomplete evacuation of stool and adverse events using a patient diary.
Multi-centre, randomized, double-blind, placebo-controlled trial investigating the effects of a nine-strain synbiotic (Vivatlac Synbiotikum) in IBS patients.