Drug Safety

, Volume 28, Issue 10, pp 891–900

The Incidence of Prescribing Errors in Hospital Inpatients

An Overview of the Research Methods
  • Bryony Dean Franklin
  • Charles Vincent
  • Mike Schachter
  • Nick Barber
Review Article

DOI: 10.2165/00002018-200528100-00005

Cite this article as:
Franklin, B.D., Vincent, C., Schachter, M. et al. Drug-Safety (2005) 28: 891. doi:10.2165/00002018-200528100-00005


Many different methods have been used to study the incidence of prescribing errors in hospital inpatients. The objectives of this review were to outline the methods used, highlight their strengths and limitations, and summarise the incidence of prescribing errors reported.

Methods used may be retrospective or prospective and based on process or on outcome. Reported prescribing error rates vary widely, ranging from 0.3% to 39.1% of medication orders written and from 1% to 100% of hospital admissions. Unfortunately, there is no standard denominator for use when expressing prescribing error rates. It could be argued that the most meaningful is the number of medication orders written; however, it is also helpful to consider the number of medication orders written per patient stay in order to understand the risk that a given prescribing error rate poses to an individual patient. Because of wide variation in the definitions and methods used, it is difficult to make comparisons between different studies.

Each method for identifying prescribing errors has advantages and disadvantages. Process-based studies potentially allow all errors to be identified, giving more scope for the identification of trends and learning opportunities, and it may be easier to collect sufficient data to show statistically significant changes in prescribing error rates following interventions to reduce them. However, studies based on process may be criticised for focusing on many minor errors that are very unlikely to have resulted in patient harm. Focusing instead on harm, as in outcome-based studies, allows efforts to reduce errors to be targeted on those areas that are likely to result in the highest impact. Therefore, the most appropriate method depends on the study’s aims. However, using a combination of methods is likely to be the most useful approach if comprehensive data are required.

Copyright information

© Adis Data Information BV 2005

Authors and Affiliations

  • Bryony Dean Franklin
    • 1
  • Charles Vincent
    • 2
  • Mike Schachter
    • 3
  • Nick Barber
    • 4
  1. 1.Academic Pharmacy Unit, Hammersmith Hospitals NHS Trust & School of PharmacyUniversity of LondonLondonUK
  2. 2.Surgical Oncology and TechnologyImperial College School of MedicineLondonUK
  3. 3.Clinical PharmacologyImperial College School of MedicineLondonUK
  4. 4.School of PharmacyUniversity of LondonLondonUK