Abstract Background Inappropriate antibiotic exposure places patients at risk for collateral damage. Hospital discharge presents an opportunity to ensure antibiotic regimens represent an appropriate continuation of inpatient therapy and adhere to evidence-based activity spectrum and therapy duration recommendations. We sought to determine the impact of a pharmacist-led antibiotic stewardship intervention on oral antibiotic prescribing at hospital discharge, informed by institutional guidelines and targeted pharmacist education. Methods This was a quasi-experimental study in which an antibiotic stewardship intervention was implemented within a 27-hospital, integrated health-system for patients discharging on oral antibiotics. Data following systemwide implementation (Jan-March 2023; POST) were compared to retrospective data without intervention (Aug-Sept 2022; PRE). The primary outcome measure was institutional guideline-discordant discharge regimens (agent, dose, duration of therapy). Secondary outcomes included treatment associated adverse-events, 30-day readmissions and treatment failure. Results A total of 560 patients were included, 300 (53.6%) in PRE and 260 (46.4%) in POST. The most common antibiotic indications were community-acquired pneumonia (13.7%), urinary tract infection (26.8%) and skin and soft tissue infection (31.1%). The most frequent discordances included extended durations of therapy (47.7%), inappropriate targeted or empiric coverage (11.4%) and fluoroquinolone use in the setting of available alternatives (7.9%). Outcome results shown in Table 1. Pharmacists intervened upon 63 (24.2%) patients in POST with an 81.0% intervention acceptance rate. Rates of guideline-discordant regimens and treatment-associated adverse events were significantly lower in POST. Both median outpatient duration of therapy and total duration of therapy were significantly lower in POST as seen in Table 2. Conclusion Hospital discharge is an important opportunity for antimicrobial stewardship programs. A pharmacist-led antibiotic stewardship initiative resulted in intervention on and optimization of guideline-discordant regimens. This initiative was also associated with both decreased antibiotic exposure and treatment-associated adverse events. Disclosures All Authors: No reported disclosures
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