Medicaid claims data have been used in other states to generate individualized "Dear Prescriber" letters (1), but these are sent weeks or months after the prescription was written. The American Recovery and Reinvestment Act (the stimulus bill) may make real-time feedback based on computerized prescription data a reality. The act contained almost $30 billion for nationwide adoption of electronic medical record systems that can link prescriber, laboratory, and pharmacy data with other patient-specific data, such as age, weight, comorbid conditions, and other medications. Such linkage could provide prescribing physicians with useful information while they are still with their patient, flagging potential problems and providing links to frequently asked questions, relevant guidelines, articles, and sources of consultation. The system could provide information that physicians are not aware of and serve as a vehicle for disseminating new clinical information. Because such a system would have access to multiple sources of patient-specific information, it might generate fewer false-positive flags or messages than systems that do not take into account patient-specific variables (2).