Potential Reached the patient without harm Required monitoring Temporary harm and required intervention Temporary harm that prolonged hopitalization MP 323 26 2 1 0 EP1 39 5 0 0 1 EP2 22 3 0 0 0

Table 4: Numbers of errors by patient outcome MP: phase 1 (manual prescription), to electronic prescription implementation EP1: phase 2 (electronic prescription), one month after electronic prescription implementation PE2: phase 3 (electronic prescription), two months after electronic prescription implementation.