Medication Errors
Medication errors are one of the most common and preventable forms of medical malpractice. From prescribing the wrong drug to dispensing the wrong dose at the pharmacy, these errors injure more than 1.3 million Americans every year — and many are entirely avoidable.
What Are Medication Errors?
A medication error is any preventable event that may cause or lead to inappropriate medication use or patient harm while the medication is in the control of a healthcare professional, patient, or consumer. These errors can occur at any point in the medication use process: prescribing, transcribing, dispensing, administering, or monitoring.
The scope of the problem is staggering. The Institute of Medicine estimates that medication errors harm at least 1.5 million people in the United States annually, causing approximately 7,000 deaths per year. In hospital settings alone, the average patient is subject to at least one medication error per day. The annual cost of treating medication error-related injuries exceeds $3.5 billion.
Prescribing errors are the most common starting point. A physician may prescribe the wrong drug due to similar-sounding drug names (a phenomenon called "look-alike, sound-alike" or LASA errors), select an inappropriate dose, fail to account for the patient's renal or hepatic function when determining dosing, or prescribe a drug that dangerously interacts with the patient's existing medications. The move to electronic prescribing has reduced some errors but introduced new ones, such as selecting the wrong drug from a dropdown menu.
Dispensing errors occur at the pharmacy level. A pharmacist may misread a prescription, fill it with the wrong drug or wrong strength, provide incorrect instructions, or fail to perform a drug utilization review that would have caught dangerous interactions or allergy conflicts. Pharmacy staffing pressures — particularly the high volume of prescriptions filled relative to the number of pharmacists on duty — contribute significantly to dispensing errors.
Administration errors happen when the medication reaches the patient. In hospitals, nurses may administer the wrong drug, give it to the wrong patient, use the wrong route (IV instead of oral, for example), or give it at the wrong time. The "five rights" of medication administration — right patient, right drug, right dose, right route, right time — are a fundamental safety check, and failure to verify any of these can result in serious harm. Barcode medication administration (BCMA) systems have been implemented in many hospitals to reduce these errors, but they are not universal and are sometimes bypassed due to time pressure.
Monitoring failures occur when a patient on a high-risk medication is not adequately monitored for adverse effects. Drugs such as warfarin (a blood thinner), chemotherapy agents, insulin, and opioids require regular monitoring of blood levels, organ function, or clinical status. Failure to order appropriate lab tests, review results, or adjust dosing in response to monitoring data can lead to overdose, organ damage, or death.
Common Examples of Medication Errors
Wrong Drug Prescribed
Prescribing a medication the patient does not need, often due to similar drug names (e.g., confusing hydroxyzine with hydralazine) or selecting the wrong item in an electronic prescribing system.
Wrong Dose or Concentration
Prescribing or dispensing a dose that is too high or too low, including decimal point errors (e.g., 1.0 mg misread as 10 mg) and failure to adjust doses for patient weight, age, or organ function.
Dangerous Drug Interactions
Prescribing or dispensing medications that interact dangerously with each other, such as combining blood thinners, mixing MAO inhibitors with SSRIs, or adding QT-prolonging drugs together.
Failure to Check Patient Allergies
Prescribing, dispensing, or administering a medication to a patient with a documented allergy, leading to anaphylaxis, severe skin reactions, or other allergic events.
Pharmacy Dispensing Errors
Filling a prescription with the wrong medication, wrong strength, or wrong quantity. This includes automated dispensing system errors and misreading of handwritten prescriptions.
Wrong Route of Administration
Administering a medication by the wrong route — such as injecting an oral medication intravenously — which can cause rapid toxicity, tissue damage, or death.
Failure to Monitor High-Risk Medications
Not performing required blood tests or clinical monitoring for patients on drugs like warfarin, lithium, chemotherapy, or immunosuppressants, leading to toxicity or organ damage.
Wrong Patient Administration
Giving a medication to the wrong patient, typically due to failure to verify patient identity using two identifiers before administration.
Key Questions an Attorney Would Investigate
Was the patient's allergy information documented and checked before prescribing?
Did the prescribing physician review the patient's current medication list for interactions?
Was the prescription legible and unambiguous, or could it have been misread?
Did the pharmacist perform a drug utilization review before dispensing?
Were the 'five rights' of medication administration verified by the nurse?
Was barcode scanning used at the point of administration, and if so, was it functioning properly?
Were appropriate monitoring labs ordered and reviewed for high-risk medications?
Did staffing levels or workload contribute to the error occurring?
Frequently Asked Questions
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