Penicillin Allergy Labels and High-risk Antibiotic Prescribing Among Incarcerated Individuals Receiving Antibiotics Across Four US Carceral Systems

Abstract Background Optimization of antibiotic prescribing is critical to reducing antimicrobial resistance, yet antimicrobial stewardship programs remain relatively uncommon in carceral settings. Despite the disproportionate health burden faced by incarcerated populations, limited data exist on the prevalence of penicillin allergy labels (PALs) in these sites. This study examined the carceral systems in 4 states (Maine, New Hampshire, Washington, and Minnesota's Hennepin County Jail) and determined the prevalence of PALs, their demographic predictors, and the relationship between PALs and the prescription of high-risk antibiotics for Clostridioides difficile infection (CDI)—as defined by the National Healthcare Safety Network. Methods We conducted a retrospective cohort study using the de-identified data from 4 carceral systems, restricted to incarcerated people who received at least 1 antibiotic prescription between 2020 and 2023. We performed univariate and multivariate logistic regression analyses, adjusting for age, sex, race, and ethnicity. We reported adjusted odds ratios (aORs) with 95% confidence intervals (CIs). Results The final study cohort consisted of 10 603 individuals, with a PAL prevalence of 10.2%. Individuals with PALs were less likely to be male (aOR, 0.462; 95% CI, 0.355–0.601) or Hispanic (aOR, 0.500; 95% CI, 0.272–0.920) and more likely to be White non-Hispanic (aOR, 1.458; 95% CI, 1.075–1.978), or American Indian/Alaska Native (aOR, 2.466; 95% CI, 1.641–3.707). PALs were significantly associated with increased odds of receiving high-risk antibiotics for CDI (aOR, 2.412; 95% CI, 1.893–3.074). Conclusions Our findings highlight the need for targeted antimicrobial stewardship and penicillin allergy de-labeling efforts among incarcerated individuals needing antibiotics.