Upadacitinib Was Administered as a Sequential Salvage Therapy for Acute Severe Ulcerative Colitis: A Case Report.

Introduction: Acute severe ulcerative colitis (ASUC) represents a medical emergency associated with high mortality and morbidity. While corticosteroids are the primary treatment, cases that are unresponsive often require rescue therapy with either infliximab or cyclosporine to reduce the rate of colectomy. Janus kinase inhibitors, such as tofacitinib and upadacitinib, are a highly efficacious therapy with rapid induction of clinical response in moderate to severe ulcerative colitis (UC).