Diagnosis of ulcerative colitis (UC) established at least 12 weeks before screening including both endoscopic evidence and a histopathology report consistent with a diagnosis of UC
Moderately to severely active UC, defined as a baseline (Week I-0) modified Mayo score of 5 to 9, inclusive, using the endoscopy subscore obtained during the central review of the screening video endoscopy
An endoscopy subscore greater than or equal to (\>=) 2 as obtained during central review of the screening video endoscopy
Adolescent Participants: body weight must be \>= 40 kilograms (kg) at baseline (Week I-0)
Adult female participants of childbearing potential and all adolescent female participants must have a negative highly sensitive serum pregnancy test (beta-human chorionic gonadotropin \[β-hCG\]) at screening and a negative urine pregnancy test at Week I-0 prior to administration of study intervention and agree to further pregnancy tests
Demonstrated an inadequate response to, or failure to tolerate conventional therapy but are naïve to advanced therapies (ADT naïve), or inadequate response to (that is, primary or secondary nonresponse) or failure to tolerate advanced therapy defined as biologics and/or advanced oral agents for the treatment of UC (ADT-inadequate responder \[IR\]) as defined in the protocol
You may not be if
Participants with current known complications of UC such as fulminant colitis, toxic megacolon, or any other manifestation that might require colonic surgery while enrolled in the study
Presence of a stoma
Presence or history of a fistula
Colonic resection within 24 weeks before baseline or any other intra-abdominal or other major surgery performed within 12 weeks before baseline
History of extensive colonic resection (that is, less than \[\<\] 30 centimeter \[cm\] of colon remaining) or colonic resection that could impair the use of disease severity assessments (for example Mayo Score) to assess response to study intervention
Clareo Health | A Protocol of Icotrokinra Therapy in Adult and Adolescent Participants With Moderately to Severely Active Ulcerative Colitis
