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Abstract Background Injection drug use (IDU) may lead to negative health outcomes and increased healthcare utilization. In US Veterans (USV) with opioid use disorder (OUD), there is sparse information about healthcare utilization, harm reduction prescription, and outcomes associated with IDU, including severe injection-related infections (SIRI). We assessed psychosocial factors, clinical outcomes, and harm reduction receipt in a cohort of USV with OUD, specifically focusing on persons who inject drugs (PWID). Methods A retrospective cohort study was performed of USV aged ≥ 18 years with a diagnosis of OUD who presented to the Northport Veterans Affairs Medical Center (Long Island, NY) between 2012 and 2022. Demographics, psychosocial factors, history of human immunodeficiency virus (HIV), hepatitis C virus (HCV) infection, and healthcare utilization were compared by IDU status. Prescription of medications for opioid use disorder, naloxone and pre-exposure prophylaxis (PrEP) for HIV were also compared by IDU status. SIRI episodes and associated sequelae were characterized in USV with IDU. Results A total of 502 USV with OUD were included and 216 (43%) were PWID. Mean age was 52.6 years. PWID were more likely to use multiple stimulants (14.4% PWID vs. 7.3% non-PWID, p |