This is a non-interventional, prospective study of participants with IBD who initiated or who are currently ongoing induction or maintenance with vedolizumab in the real world setting.~The study will enroll approximately 120 participants. The data will be collected prospectively at the study sites and will be recorded into electronic case report forms (e-CRFs). All the participants will be assigned to a single observational cohort:~Participants with IBD~This multi-center study will be conducted in Croatia and Slovenia having specialized gastroenterology centers. The overall duration of the study will be at least 26 months. Data will be collected at baseline, at 3 months (+/- 1 month) after induction, and every 6 months (+/- 1 month) after that, and at the time of switch, discontinuation and/or at routine follow-up visits up to 12 months.
Inflammatory bowel disease consists of either ulcerative colitis (UC) or Crohn's disease (CD).~The main aim of this study is to describe real-world treatment patterns in adults with moderate to severe ulcerative colitis or Crohn's disease when treated with vedolizumab. This will include the administration choices which can either be an infusion through a vein (intravenous or IV), or an injection just under the skin (subcutaneous injection, or SC).~Treatment will be determined by the study doctor according to routine clinical practice.