An example of care decision of the appropriate uses of antimicrobial agents using electronic medical chart information and the cautionary message to the prescribers on the electronic medical chart system. Appropriateness of antibiotic selection, usage, dosage was determined by using information of microbiological laboratory results, site of infection, renal function, serum drug concentration, which was obtained by the electronic medical chart. For patients receiving intravenous antibiotics for long periods exceeding 2 weeks, a cautionary message was notified by the ICT member