Class of 2007 Abstract / Objectives: The purpose of this study is to determine if an antibiotic formulary is beneficial in an inpatient ICU setting. The main goal, of course, is to ensure patients receive the most appropriate antimicrobial therapy resulting in the least amount of resistance, by using an antibiotic formulary and ICU antibiotic intervention. Methods: This project will use a retrospective design in which one-year post-intervention antibiotic resistant trends will be compared with pre-intervention trends at Yuma Regional Medical Center (YRMC). As is common at YRMC, patients started on antibiotic therapy had susceptibility testing performed to determine the best treatment for the patient. This susceptibility data will be the data used for comparison. Comparison of patient charges and hospital costs associated with these patients will also be performed. YRMC employed an ICU antibiotic intervention documentation form that was used to monitor and extrapolate intervention data. Hospital lab percent susceptibility data will be looked at to determine isolate susceptibility data to determine if any trends are present in antibiotic resistance between the time period when the antibiotic formulary was implemented and the previous corresponding period of time before the formulary. This data will also be compared with the hospital trends in resistant isolates as a whole. The data is desensitized, as individual patient data is not being reviewed. In looking at patient charges and hospital costs, charts will be reviewed. These charts will be de-identified to the investigators of this study. Of further note, YRMC placed the intervention in action in February 2006 and began collecting post-intervention data at that time. This study will be using post intervention data collected from February 2006 thru February 2007. Results: Conclusions: