A study to assess the safety and effectiveness of Velsipity Tablets 2 mg during long-term treatment (up to a maximum of 52 weeks) in patients with ulcerative colitis under actual medical practice.

Patients must meet all of the following inclusion criteria to be eligible for inclusion in the study:

1. Patients with moderate to severe ulcerative colitis for whom treatment with this drug was started for the first time after the contract date for this study. Patients who have participated in a clinical study of this drug in the past or patients who have participated in this study are excluded.
2. Patients who understand the contents of this study and give consent to provision of the information collected in this study to third parties and the use of it for other purposes.

Patients with moderate to severe ulcerative colitis for whom treatment with this drug was started for the first time after the contract date for this study.

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.