Background and Significance: Adverse drug events (ADE) are the most common of all healthcare associated adverse events. Transitions between inpatient and ambulatory care can lead to ADE and avoidable healthcare utilization affecting up to 20% of patients. Insufficient monitoring has been identified as a particularly common cause of preventable and ameliorable ADE. The Joint Commission for Accreditation of Healthcare Organizations (JCAHO) has called for a process to "accurately and completely reconcile medications across the continuum of care." Inpatient computerized medication reconciliation tools have shown great potential, but little is known about successful medication reconciliation strategies immediately post-discharge. One promising solution to outpatient medication reconciliation is the use of secure electronic communication (SEC) between patients, accessing their personal health record via a web portal, and providers within an electronic health record. Surveys have consistently found that patients want to communicate with their primary care providers via SEC, and SEC is rapidly becoming a standard feature in electronic health records. A SEC-based approach to outpatient medication reconciliation following hospital discharge has the potential to improve patient safety, but important questions must be addressed, including: What information needs to be included in the SEC? What elements of the SEC are essential to its design? How can SEC be best incorporated into the workflow of the primary care office practice? Will patients and physicians find this approach acceptable? To address these questions, we propose a one-year pilot study at VA Boston with the following specific aims: