Class of 2012 Abstract / Specific Aims: Assess the stability and sterility of various extemporaneously compounded captopril solution in different storage conditions. Methods: Extemporaneously prepared captopril standards and solutions tested in a high performance liquid chromatography instrument collected data on stability. In addition, physical appearance, bacterial growth and pH data were also collected. Main Results: Stability data was assessed with extemporaneously prepared captopril solutions prepared with standardized captopril powder, captopril tablets and captopril tablets with ascorbic acid included. Stability was defined as retention of at least 90% of the initial captopril concentration. Overall, all preparations were stable when stored at 4°C but only the tablet preparation was stable when stored at 25°C and 40°C. No bacterial growth was observed with any of the captopril solutions. Conclusions: Extemporaneously prepared captopril solution appears to have a shelf-life of at least 28 days when stored at 4°C.