Few data exist about the impact of computerized prescribing systems on outpatient medication errors (MEs) and adverse drug events (ADEs). We compared the rates of MEs and ADEs in handwritten sites versus sites with basic computerized prescribing. These systems reduced ME rates but did not significantly reduce ADE rates. Failure to monitor accounted for a large percentage of preventable ADEs. More advanced computerized prescribing systems with decision support and monitoring functions may be necessary to reduce outpatient ADE rates.
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