Prescription errors can be minimized by observing all of the following practices
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by Frank Federico, RPh, Executive Director, Institute for Healthcare Improvement One of the recommendations to reduce medication errors and harm is to use the “five rights”: the right patient, the right drug, the right dose, the right route, and the right time. When a medication error does occur during the administration of a medication, we are quick to blame the nurse and accuse her/him of not completing the five rights. The five rights should be accepted as a goal of the medication process not the “be all and end all” of medication safety. Judy Smetzer, Vice President of the Institute for Safe Medication Practices (ISMP), writes, “They are merely broadly stated goals, or desired outcomes, of safe medication practices that offer no procedural guidance on how to achieve these goals. Thus, simply holding healthcare practitioners accountable for giving the right drug to the right patient in the right dose by the right route at the right time fails miserably to ensure medication safety. Adding a sixth, seventh, or eighth right (e.g., right reason, right drug formulation, right line attachment) is not the answer, either.” [The five rights: A destination without a map. ISMP Medication Safety Alert. January 25, 2007;12(2).] The five rights focus on individual performance and not on human factors and system defects that may make completing the tasks difficult or impossible. There are a number of factors that may interfere with a nurse’s ability to complete these functions. Ms. Smetzer continues, “Thus, the healthcare practitioners’ duty is not so much to achieve the five rights, but to follow the procedural rules designed by the organization to produce these outcomes. And if the procedural rules cannot be followed because of system issues, healthcare practitioners also have a duty to report the problem so it can be remedied.” Journal Article J.K. Aronson From the Department of Primary Health Care, Rosemary Rue Building, Old Road Campus, Headington, Oxford OX3 7LF, UK Search for other works by this author on:
Close Navbar Search Filter Microsite Search Term Search AbstractA medication error is a failure in the treatment process that leads to, or has the potential to lead to, harm to the patient. Medication errors can occur in deciding which medicine and dosage regimen to use (prescribing faults—irrational, inappropriate, and ineffective prescribing, underprescribing, overprescribing); writing the prescription (prescription errors); manufacturing the formulation (wrong strength, contaminants or adulterants, wrong or misleading packaging); dispensing the formulation (wrong drug, wrong formulation, wrong label); administering or taking the medicine (wrong dose, wrong route, wrong frequency, wrong duration); monitoring therapy (failing to alter therapy when required, erroneous alteration). They can be classified, using a psychological classification of errors, as knowledge-, rule-, action- and memory-based errors. Although medication errors can occasionally be serious, they are not commonly so and are often trivial. However, it is important to detect them, since system failures that result in minor errors can later lead to serious errors. Reporting of errors should be encouraged by creating a blame-free, non-punitive environment. Errors in prescribing include irrational, inappropriate, and ineffective prescribing, underprescribing and overprescribing (collectively called prescribing faults) and errors in writing the prescription (including illegibility). Avoiding medication errors is important in balanced prescribing, which is the use of a medicine that is appropriate to the patient's condition and, within the limits created by the uncertainty that attends therapeutic decisions, in a dosage regimen that optimizes the balance of benefit to harm. In balanced prescribing the mechanism of action of the drug should be married to the pathophysiology of the disease. IntroductionIn 2000, an expert group on learning from adverse events in the NHS, chaired by the Chief Medical Officer, reported that since 1985 there had been at least 13 episodes in which people (usually children) had been killed or paralysed because of wrong administration of drugs by spinal injection; 12 involved vinca alkaloids; 10 were fatal.1 Serious medication errors are uncommon, but it is salutary that it took so long to recognize that remedial action was needed in this case.2 Even so, this error continues to be made.3 Some basic definitionsA medicationA medication (a medicinal product) is ‘a product that contains a compound with proven biological effects, plus excipients or excipients only; it may also contain contaminants; the active compound is usually a drug or prodrug, but may be a cellular element’.4 A codicil to this definition stipulates that a medicinal product is one that is intended to be taken by or administered to a person or animal for one or more of the following reasons: as a placebo; to prevent a disease; to make a diagnosis; to test for the possibility of an adverse effect; to modify a physiological, biochemical or anatomical function or abnormality; to replace a missing factor; to ameliorate a symptom; to treat a disease; to induce anaesthesia. Medication (the process) is the act of giving a medication (the object) to a patient for any of these purposes. This definition reminds us of the distinction between the drug itself (the active component) and the whole product, which also contains supposedly inactive excipients. The definition of a medication encompasses not only chemical compounds—drugs, prodrugs (which may themselves have no pharmacological activity), stereoisomers that may have only adverse effects, or compounds that are used for diagnostic purposes (such as contrast media); it also includes cellular elements, such as inactivated or attenuated viruses for immunization, blood products (such as platelets), viruses for gene therapy, and embryonic stem cells; ‘contaminants’ includes chemical and biological contaminants and adulterants, the former being accidentally present the latter deliberately added. Although the definition covers a wide range of compounds, it does not include medications when they are used to probe systems for non-diagnostic purposes, such as the use of phenylephrine to study baroreceptor reflexes in a physiological or pharmacological experiment. An errorAn error is ‘something incorrectly done through ignorance or inadvertence; a mistake, e.g. in calculation, judgement, speech, writing, action, etc.’5 or ‘a failure to complete a planned action as intended, or the use of an incorrect plan of action to achieve a given aim’.6 Other definitions have been published.7 A medication errorWith these definitions in mind, a medication error can be defined as ‘a failure in the treatment process that leads to, or has the potential to lead to, harm to the patient’.8,9 The ‘treatment process’ involves all medications, as defined above. Medication errors can occur in:
The term ‘failure’ in the definition implies that certain standards should be set, against which failure can be judged. All those who deal with medicines should establish or be familiar with such standards. They should institute or observe measures to ensure that failure to meet the standards does not occur or is unlikely. Everybody involved in the treatment process is responsible for their part of the process. Adverse events and adverse drug reactionsAn adverse event is ‘any abnormal sign, symptom or laboratory test, or any syndromic combination of such abnormalities, any untoward or unplanned occurrence (e.g. an accident or unplanned pregnancy), or any unexpected deterioration in a concurrent illness’.4 If an adverse event occurs while an individual is taking a drug it could be an adverse drug reaction (ADR). The term ‘adverse drug event’ is sometimes used to describe this, but it is a bad term and should be avoided.4 If an adverse event is not attributable to a drug it remains an adverse event; if it may be attributable to a drug it becomes a suspected ADR. An ADR is ‘an appreciably harmful or unpleasant reaction, resulting from an intervention related to the use of a medicinal product’4. Some medication errors result in ADRs but many do not; occasionally a medication error can result in an adverse event that is not an ADR (for example, when a cannula penetrates a blood vessel and a haematoma results). The overlap between adverse events, ADRs, and medication errors is illustrated in the Venn diagram in Figure 1.8 Figure 1. A Venn diagram showing the relation among adverse events, ADRs and medication errors; the sizes of the boxes do not reflect the relative frequencies of the events illustrated (Reproduced from reference 8, with permission from Wolters Kluwer Health/Adis ©; Adis Data Information BV (2006); all rights reserved). Frequency and outcomes of medication errorsThe precise frequencies of medication errors are not known. The method of detection can affect the estimated frequency.10 Probably most errors go unnoticed (the error iceberg11); of those that are detected a minority actually result in ADRs, or at least serious ones. For example, in a UK hospital study of 36 200 medication orders, a prescribing error was identified in 1.5% and most (54%) were associated with the choice of dose; errors were potentially serious in 0.4%.12 In a survey of 40 000 medication errors in 173 hospital trusts in England and Wales in the 12 months to July 2006, collected by the National Patient Safety Agency, ∼15% caused slight harm and 5% moderate or severe harm.13 In a US study, 1.7% of prescriptions dispensed from community pharmacies contained errors.14 Since ∼3 billion prescriptions are dispensed each year in the USA, ∼50 million would contain errors. Of those, only ∼0.1% were thought to be clinically important, giving an annual incidence of such errors of about 50 000. Wrong label information and instructions were the most common types of errors. However, it is important to detect medication errors, whether important or not, since doing so may reveal a failure in the treatment process that could on another occasion lead to harm. There is also evidence that the death rate from medication errors is increasing. From 1983 to 1993 the numbers of deaths from medication errors and adverse reactions to medicines used in US hospitals increased from 2876 to 739115 and from 1990 to 2000 the annual number of deaths from medication errors in the UK increased from about 20 to just under 200.16 These increases are not surprising—in recent years hospitals have seen increased throughput of patients, new drugs have emerged that are increasingly difficult to use safely and effectively, medical care has become more complex and specialized, and the population has aged, factors that tend to increase the risk of medication errors.17 When errors are detected, they can cause much dissatisfaction. According to a 2000 report citing UK medical defence organizations,1 25% of all litigation claims in general medical practice were due to medication errors and involved the following errors:
Types of medication error and preventionThe best way to understand how medication errors happen and how to avoid them is to consider their classification, which can be contextual, modal, or psychological. Contextual classification deals with the specific time, place, medicines and people involved. Modal classification examines the ways in which errors occur (for example, by omission, repetition or substitution). Psychological classification is to be preferred, as it explains events rather than merely describing them. Its disadvantage is that it concentrates on human rather than systems sources of errors. The following psychological classification is based on the work of Reason on errors in general.18 There are four broad types of medication errors (labelled 1–4 in Figure 2).8
For some examples of prescription errors see Table 1. Examples of other types of medication errors under the same headings are given in reference 8. Table 1 Examples of prescribing faults and prescription errors
aThis stresses the importance of prescribing by generic name whenever possible, since more errors are made by confusing brand names than generic names; however, in this case ‘Priadel’ had to be prescribed—modified-release formulations of lithium must be prescribed by brand name because of differences in bioavailability from brand to brand. Table 1 Examples of prescribing faults and prescription errors
aThis stresses the importance of prescribing by generic name whenever possible, since more errors are made by confusing brand names than generic names; however, in this case ‘Priadel’ had to be prescribed—modified-release formulations of lithium must be prescribed by brand name because of differences in bioavailability from brand to brand. Latent factorsMistakes (knowledge- and rule-based errors), slips (action-based errors) and lapses (memory-based errors) have been called ‘active failures’.18 However, there are several properties of systems (so-called ‘latent factors’) that make prescribers susceptible to error. For example, working overtime with inadequate resources, poor support, and low job security all contributed to an increased risk of medication errors by nurses.24 Among doctors depression and exhaustion are important.25,26 Errors are more likely to occur when tasks are carried out after hours by busy, distracted staff, often in relation to unfamiliar patients.19 There is a particular risk of errors when doctors first arrive in hospital, because of shortcomings in their knowledge,16 and presumably also because they are unfamiliar with local prescription charts and other systems. Improved education and improved working conditions, including better induction processes, should reduce the risk of errors that are due to these factors; a national prescription form would help. Detecting and reporting errorsOne difficulty in detecting errors is that those who make them fear disciplinary procedures and do not want to report them.27 The establishment of a blame-free, non-punitive environment can obviate this.28 The reporting of errors, including near-misses, should be encouraged, using error reports to identify areas of likeliest occurrence and simplifying and standardizing the steps in the treatment process. However, some systems for voluntarily reporting medical errors are of limited usefulness, because reports often lack details and there is incomplete reporting and underreporting.29 A medication error reporting system should be readily accessible, with clear information on how to report a medication error, and reporting should be followed by feedback; detection may be improved by using a combination of methods.30 Prescribing faults and prescription errorsErrors in prescribing can be divided into irrational prescribing, inappropriate prescribing, ineffective prescribing, underprescribing and overprescribing, and errors in writing the prescription. The inadequacy of the term ‘error’ to describe all of these is obvious. Failing to prescribe an anticoagulant for a patient in whom it is indicated (underprescribing) or prescribing one when it is not indicated (overprescribing) are different types of error from errors that are made when writing a prescription. I therefore prefer to use the terms ‘prescribing faults’ and ‘prescription errors’.9 The term ‘prescribing errors’ ambiguously encompasses both types. Prescribing faultsIrrational and inappropriate prescribing‘Rational’ is defined in the Oxford English Dictionary as ‘based on, derived from, reason or reasoning’ and ‘appropriate’ as ‘specially fitted or suitable, proper’.5 One would expect rational prescribing to be appropriate, but that is not always the case. A rational approach can result in inappropriate prescribing, if it is based on missing or incorrect information. If, for example, one does not know that another prescriber has already prescribed paracetamol unsuccessfully for a headache, a prescription for paracetamol might be rational but inappropriate. Consider an example from my own practice.31 • A woman with Liddle's syndrome presented with severe symptomatic hypokalaemia. Her doctor reasoned as follows:
• She took a full dose of spironolactone for several days, based on this logical reasoning, but still had severe hypokalaemia. Her doctor should have reasoned as follows:
• When she was given amiloride instead of spironolactone her serum potassium concentration rapidly rose to within the reference range. This stresses the importance of understanding the relation between the pathophysiology of the problem and the mechanism of action of the drug (see below). Ineffective prescribingIneffective prescribing is prescribing a drug that is not effective for the indication in general or for the specific patient; it is distinct from underprescribing (see below). In a study of 212 patients, 6% of 1621 medications were rated as ineffective.32 Of 196 US out-patients aged 65 and older who were taking five or more medications, 112 (57%) were taking a medication that was ineffective, not indicated, or duplicative.33 And in a Scottish study, 49% of general practices prescribed homoeopathic remedies, 5% of practices accounting for 50% of the remedies prescribed.34 One would expect ineffective prescribing to be minimized by the use of guidelines, but there is conflicting evidence; prescribing guidelines may be ineffective unless accompanied by education or financial incentives.35 UnderprescribingUnderprescribing is failure to prescribe a drug that is indicated and appropriate, or the use of too low a dose of an appropriate drug. The true extent of underprescribing is not known, but there is evidence of significant underprescribing of some effective treatments, such as angiotensin converting-enzyme inhibitors for patients with heart failure36 and statins for hyperlipidaemia.37 The sources of underprescribing include fear of adverse effects or interactions, failure to recognize the appropriateness of therapy, and doubts or ignorance about likely efficacy. Cost may play a part.38 There is a tendency to avoid treatment in older people,39,40 and this can lead to unwanted effects,28 including the so-called risk-treatment mismatch, in which those who are at greatest risk are less aggressively treated, an effect that may be partly associated with age.41 However, other factors may contribute to this type of mismatch, such as distraction by co-morbidities, miscalculation of the true benefit to harm balance and a reluctance to undertake or exacerbate polypharmacy.42 In a study of the relation of underprescribing to polypharmacy in 150 elderly patients, the probability of underprescribing increased significantly with the prescribed number of drugs.43 This resulted in failure to use β-adrenoceptor antagonists after myocardial infarction, ACE inhibitors for heart failure, anticoagulants in atrial fibrillation and bisphosphonates in osteoporosis. OverprescribingOverprescribing is prescribing a drug in too high a dosage (too much, too often or for too long). In some cases treatment is not necessary at all. For example, among hospital patients who were given a proton pump inhibitor treatment was indicated in only half.44 Polypharmacy, defined as the use of five or more drugs, occurs in >10% of people aged over 65 years in the UK.45 And although not all polypharmacy is inappropriate,46 some undoubtedly leads to ADRs and drug-drug interactions. Overuse of antibiotics is well known and much discussed. A systematic review of 55 trials showed that no single strategy or combination of strategies was better than any other and none was highly effective, although the authors singled out active education of clinicians as a strategy to pursue.47 In a Spanish study, those who overprescribed were more likely to be in rural practices, further from specialist centres, caring for children, lacking postgraduate education and in part-time or short-term work.48 In some countries, doctors’ income may have an effect.49 Prescription errorsAll the factors that lead to medication errors in general contribute towards prescription errors. They include lack of knowledge, using the wrong drug name, dosage form, or abbreviation, and incorrect dosage calculations.50 In a US study of about 900 medication errors in children, ∼30% were prescription errors, 25% were dispensing errors and 40% were administration errors.51 In one study the most common form of prescription error was writing the wrong dose.12 In six Oxford hospitals the most common errors on prescription charts were writing the patient's name incorrectly and writing the wrong dose, which together accounted for ∼50% of all errors.16 In a hospital study of 192 prescription charts, only 7% were correctly filled; 79% had errors that posed minor potential health risks and 14% had errors that could have led to serious harm.52 Table 1 lists some examples of prescribing faults and prescription errors under the headings of the four types of error. The remedies are as outlined above. The hedgehog principle and balanced prescribingThe major barrier to rational, appropriate and effective prescribing is failure to apply what I call the hedgehog principle. The Greek poet Archilochus (seventh century BC) wrote that ‘The fox knows many things, the hedgehog one big thing’. What he meant is not clear, since the text is fragmentary, but Isaiah Berlin suggested that it could be interpreted as distinguishing between ‘those who relate everything to a single central vision [hedgehogs] … and those who pursue many ends [foxes]’.53 As a prescriber I am a hedgehog, and the one big idea to which I subscribe is the need to marry the mechanism of action of the drug to the pathophysiology of the disease. Using amiloride to treat hypokalaemia in Liddle's syndrome (as described above) is a perfect example of this principle. If in addition one pays attention to the balance of benefit and harm, one achieves ‘balanced prescribing’, defined as the use of a medicine that is appropriate to the patient's condition and, within the limits created by the uncertainty that attends therapeutic decisions, in a dosage regimen that optimizes the balance of benefit to harm.54 Note that this definition includes the two components of the hedgehog principle: the disease and the medicine. Achieving balanced prescribingNine questions should be asked before writing a prescription (adapted from the Medication Appropriateness Index55,56):
The mnemonic for this list is ‘i.e. do I dope?’. Each item relates to an important process in prescribing, and in the absence of evidence that following this schedule improves prescribing, it makes sense to use it. Conclusion: a prescription for better prescribingWe all make errors from time to time. There are many sources of medication errors and different ways of avoiding them. However, we must start by being aware that error is possible and take steps to minimize the risks. The essential components of this are monitoring for and identifying errors, reporting them in a blame-free environment, analysis of their root causes,57 changing procedures according to the lessons learnt and further monitoring. How can we improve prescribing and reduce medication errors? Five prescriptions might help35,58:
Conflict of interest: None declared. References1 Department of Health An Organisation with a Memory , Report of an Expert Group on Learning from Adverse Events in the NHS Chaired by the Chief Medical Officer , 2000 London The Stationery Office 2 . The Prevention of Intrathecal Medication Errors , A Report to the Chief Medical Officer , 2001 London The Stationery Office 3 . Doctor sentenced for manslaughter of leukaemia patient , Br Med J , 2003 , vol. 327 pg. 697 4 , . Clarification of terminology in drug safety , Drug Saf , 2005 , vol. 28 (pg. 851 - 70 ) 5 Oxford English Dictionary [online] Accessed 10 April 2009 [http://ezproxy.ouls.ox.ac.uk:2118/entrance.dtl] 6 , , . To Err is Human: Building a Safer Health System , 1999 Washington DC Institute of Medicine 7 , , . Multiplicity of medication safety terms, definitions and functional meanings: when is enough enough? , Qual Saf Health Care , 2005 , vol. 14 (pg. 358 - 63 ) 8 , . 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More from Oxford Academic What are some strategies that can be used to reduce medication errors?10 Strategies to Reduce Medication Errors. MINIMIZE CLUTTER. ... . VERIFY ORDERS. ... . USE BARCODES. ... . BE AWARE OF LOOK-ALIKE SOUND-ALIKE (LASA) DRUGS. ... . HAVE A SECOND PAIR OF EYES CHECK PRESCRIPTIONS. ... . DESIGN EFFECTIVE WARNING SYSTEMS. ... . INVOLVE THE PATIENT. ... . TRUST YOUR GUT.. What are the 3 checks of medication administration?WHAT ARE THE THREE CHECKS? Checking the: – Name of the person; – Strength and dosage; and – Frequency against the: Medical order; • MAR; AND • Medication container.
What are the top 5 medication errors?Top 5 Most Common Prescription Drug Errors. Lack of awareness of expiration dates. Advertisement. ... . Taking the incorrect dosage. ... . Rate of usage. ... . What time of day to take the drug. ... . Combining drugs without physician guidance.. What is the key to preventing medication errors?Control access to medications.
All medications dispensed to patients should be properly labeled with the name of the medication, strength, dose, frequency, purpose, lot number, expiration date and quantity of medication, along with the patient's name, date of dispensing and prescribing, and prescribing information.
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