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Background The Centers for Disease Control and Prevention published The Core Elements of Hospital Antibiotic Stewardship Programs in 2014, which recommended that all clinicians perform an antibiotic time out (ATO) after 48 hours. The best methods to operationalize these recommendations remain unclear. Given our information technology barriers, we developed a targeted, pharmacist-driven, 48 hour ATO pilot. Methods This pre-post intervention pilot study included hospitalized adults admitted to one of the four wards between 5/1/18 and 6/30/18. Patients who received ≥48 hours of broad-spectrum intravenous antibiotics (vancomycin, piperacillin–tazobactam, cefepime, a carbapenem, or a fluoroquinolone) were prospectively identified via TheraDoc (Premier Inc., Charlotte, NC). An infectious diseases (ID) trained pharmacist reviewed patients on a daily basis during June. The primary outcome was days of therapy (DOT), which was assessed with Spearman’s rank-order correlation. All P-values were from 2-sided tests, and results were deemed statistically significant at P &lt; 0.05. Results A total of 151 unique patients were identified during the study period. The most common antibiotic indications were skin and soft-tissue infection (31.1%), urinary tract infection (22.5%), and intraabdominal infection (22.5%). An ID physician was consulted on 59% of patients. The pharmacist reviewed an average of 7 patients (3 unique) each day during the intervention month. A total of 27 recommendations were made with 15 (56%) being accepted. The most common recommendations were to de-escalate therapy (n = 8), stop antibiotics (n = 6), and add a stop date to the antibiotic order (n = 4). DOT in the pre- and post-intervention period did not differ (P = 0.28). Conclusion A month-long, targeted, pharmacist-driven, 48 hour ATO pilot was unable to demonstrate a reduction in DOT. Furthermore, only 56% of pharmacist recommendations were accepted despite targeting low-acuity infections, which may have limited our ability to observe a reduction in DOT. Larger studies are warranted to further evaluate how ATOs influence DOT over time. Disclosures All authors: No reported disclosures.

1037. A Pharmacist-Driven 48 Hour Antibiotic Time Out Pilot at a Large Academic Medical Center