The purpose of this study is to assess the long-term safety of vedolizumab versus other biologic agents in participants with Ulcerative Colitis (UC) or Crohn's Disease (CD).

The drug being tested in this prospective, observational study is called vedolizumab. Vedolizumab is being used to treat people who have UC or CD. This study will look at the long-term safety of vedolizumab versus other biologic agents in participants with UC or CD. The study will enroll approximately 5000 participants. All participants enrolled in this will belong to one of the two treatment group:

• Vedolizumab
• Other Biologic Agents -adalimumab, certolizumab pegol.

Golimumab and infliximab. Study drugs will be prescribed by the physician according to local prescribing information in the participating countries. This multi-centre trial will be conducted worldwide. The overall time to participate in this study is 7 years. Participants will make visits at every 6 months to their treating physician.

Inclusion Criteria:

1. Signed informed consent, by the participant or a legally acceptable representative.
2. Aged at least 18 years.
3. Initiating vedolizumab or another biologic agent for UC or CD.
4. Signed release form, by the participant or a legally acceptable representative, permitting abstraction of the participant's medical records at Baseline and during participation in the study.

Exclusion Criteria:

1. The participant is enrolled in a clinical trial in which treatment for CD or UC is managed through a protocol.
2. Prior treatment with vedolizumab.
3. Any other reason that, in the Investigator's opinion, makes the participant unsuitable to participate in this study.

Participants with ulcerative colitis (UC) or Crohn's disease (CD) who are initiating Entyvio or another biologic agent. Participants may be biologic-naive or have prior use of a biologic agent

Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.

IPD from eligible studies will be shared with qualified researchers according to the criteria and process described on https://vivli.org/ourmember/takeda/. For approved requests, the researchers will be provided access to anonymized data (to respect patient privacy in line with applicable laws and regulations) and with information necessary to address the research objectives under the terms of a data sharing agreement.