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Background In light of recently published clinical and pharmacokinetic data regarding the use of daptomycin in obese patients, the Charleston Area Medical Center (CAMC) Antimicrobial Stewardship Program implemented an adjusted body weight dosing strategy for obese patients. Along with this new dosing strategy, an effort to reduce drug waste was also implemented by restricting the timing of routinely scheduled daptomycin doses for inpatients. This study aims to determine the clinical outcomes for patients receiving daptomycin both before and after this policy change. Secondary objectives include assessing creatinine phosphokinase (CK) levels in the study participants, defining the risk of CK elevation with the coadministration of HMG Co-A reductase inhibitors and daptomycin, and assessing any reduction in drug waste for the pharmacy department. Methods This study is a single-center, one-group pretest-posttest, quasi-experimental study evaluating the implementation of a two-part daptomycin dosing policy. The pretest group included all patients meeting inclusion and exclusion criteria that received daptomycin at CAMC from September 1 - November 30, 2017. The new daptomycin dosing policy was implemented on September 1, 2018. The posttest group included all patients meeting the stated criteria that received daptomycin from September 1 - November 30, 2018. Results A total of 118 patients were included in this study. There were 5 (7.7%) treatment failures in the pretest group and 3 (5.7%) in the posttest group (P = 0.7). Of the patients with CK levels monitored, 6 (33%) were found to have significant elevations in the pretest group and 4 (40%) were found in the posttest group (P = 0.6). There was no difference observed in the risk of CK elevation with daptomycin administration in the presence of an HMG-CoA reductase inhibitor. For the two time periods reviewed, the pharmacy department purchased fewer vials of daptomycin in the posttest group. Conclusion Patients at CAMC receiving daptomycin after implementation of a new dosing policy did not experience an increased risk of treatment failure. The Antimicrobial Stewardship Program will continue to monitor patients receiving daptomycin therapy at CAMC. Disclosures All authors: No reported disclosures.

1029. Clinical and economic outcomes of a newly implemented daptomycin dosing policy in a four-hospital health system