Opioid use has not been shown to improve hospitalized inflammatory bowel disease patient pain scores and may prolong the length of stay (LOS). Additional clinical implications of opioid use, particularly high amounts, in the hospital setting have not yet been explored. We sought to determine how high opioid use impacts clinical outcomes in acute severe ulcerative colitis (ASUC). In this single-center study, we identified all patients hospitalized with ASUC who received intravenous corticosteroids from July 1, 2014 to December 31, 2021. Clinical outcomes including opioid exposure, cumulative intravenous corticosteroid dose, biologic rescue therapy initiation date, colectomy rate, opioid prescription at discharge, LOS, and hospitalization cost were collected. High opioid use was defined as ≥40 oral morphine equivalents (OMEs) per day. A univariable logistic regression was performed to evaluate the association of high opioid use with ASUC outcomes. 185 eligible hospitalizations for ASUC were evaluated. 75 patients (41%) received opioids during hospitalization, and 20 patients (11%) received ≥40 OMEs/day. High opioid use was associated with a median 3-day delay in biologic rescue therapy initiation when compared with low/no opioid use (P = .02). 70% of patients with high opioid use received an opioid prescription at discharge compared with 10% of those with low/no use (P < .001). Opioid use was not associated with LOS, duration of corticosteroid therapy, colectomy rate, or hospitalization cost. Among ASUC hospitalizations, high opioid use was associated with delayed biologic rescue therapy initiation and higher rates of opioid prescriptions at discharge.