Some evidences have shown that probiotics are effective in the treatment of irritable bowel syndrome. Because few evidences are available in our population, we investigated if probiotics are effective in our patients as well. We hypothesize that the probiotic Lactol which contains Lactobacillus Sporogenes reduces the symptoms of irritable bowel syndrome.

Inclusion Criteria:

• age between 18 and 65
• diagnosis of IBS based on the Rome III criteria
• willingness to participate

Exclusion Criteria:

• receiving other probiotics compound during the study
• receiving antibiotics during the study