The advancement of computerized physician order entry system has delivered a fast social move in the realm of medication, introducing both new difficulties just as open doors for improving medicinal services. As clinicians work to adjust to the progressions forced by the CPOE, identification of best practices are required for CPOE’s effective implementation. Using the references of published articles on CPOE’s effective implementation and obstacles in its adherence in hospitals, this article aims to identify best practices and useful tools in effective implementation of CPOE. This review is based on a search of Medline, the Cochrane Database of Systemic Reviews, and citation lists of relevant publications. Subject heading and key words used include construction and working of CPOE, CPOE related errors, impact of CPOE on medication errors and obstacles in CPOE effective implementation. Only articles in English were included.