Effect and Tolerance of a Probiotic-based Medical Device Administered to Patients With Irritable Bowel Syndrome

Inclusion Criteria: * Adult (age ≥ 18 years) * Suffering from IBS (Rome IV criteria), whatever the predominant stool pattern, i.e recurrent abdominal pain, on average, at least 1 day per week in the last 3 months, associated with 2 or more of the following criteria: Related to defecation; Associated with a change in frequency of stool; Associated with a change in form (appearance) of stool; with symptom onset at least 6 months before diagnosis; * Having access to electronic tools (computer, tablet…) and an internet connection, allowing him to complete the online self-questionnaire. Exclusion Criteria: * Presence of clinical signs of alarm such as rectorrhagia, fever or recent unexpected weight loss or patient with suspicion or evidence of diseases that exclude IBS diagnosis: including but not limited to inflammatory gastrointestinal disease (e.g. Crohn's disease, ulcerative colitis), colorectal cancer, celiac disease, hyperthyroidism, intestinal infection, lactose intolerance, other malabsorption syndromes (e.g.: fructose), bile acid malabsorption; * History of abdominal surgery except appendectomy; * Allergy or hypersensitivity to one of the ingredients of the medical device; * Inability to fill self-questionnaires or to understand the information notice (cognitive or linguistic issues); * Participation to another clinical study or in the exclusion phase of a previous clinical study; * Refusal to participate.