1 Medication Errors and the Medication-Use System
Learn how medication use moves through connected stages, how errors and medication-related harm differ, and how human factors and system design can help explain and reduce hazards.
The medication-use process
Medication safety depends on a chain of connected steps, not on a single action. A problem at one stage can pass into later stages unless a person or safety measure detects it. Errors can occur in hospitals, clinics, pharmacies, long-term-care facilities, and patients’ homes.
The medication-use process typically includes:
Prescribing or ordering: Select the medicine, dose, route, frequency, and duration based on the patient’s needs.
Transcribing and communicating: Transfer the order accurately between people and information systems.
Reviewing and verifying: Check the order against the patient’s history, allergies, current medicines, and relevant clinical information.
Dispensing and preparing: Select, label, measure, or prepare the medication.
Administering or taking: Give or use the medicine as intended.
Monitoring and follow-up: Evaluate effects, side effects, and whether treatment should continue or change.
Errors and medication-related harm
A is a preventable event that may cause or lead to inappropriate medication use or harm. It can occur anywhere in the medication-use process, and the medicine does not have to reach the patient for an error to have occurred. An error caught before reaching the patient is often called a ; one that reaches the patient may or may not cause harm.
An is harm associated with medication use. Some adverse drug events are preventable and result from errors, but others may occur even when a medication is prescribed and used correctly. Therefore, a does not automatically mean the patient was harmed, and medication-related harm does not always prove that an error occurred.
Common types of medication errors
Medication errors can be classified by what went wrong or where in the process it happened. Common types include:
Wrong medication: A different medicine is selected or dispensed than the one intended.
Wrong patient: A medicine is given to someone other than the intended patient.
Wrong dose or strength: An error occurs in calculation or measurement, or with a decimal point.
Wrong route or dosage form: For example, an oral product is used when an injectable product was intended.
Wrong time, frequency, or duration: A dose is administered too early, too late, too often, or for too long.
Omission: A prescribed dose is missed or not given.
Documentation or communication error: An order or administration is recorded inaccurately or not communicated clearly.
Monitoring error: A needed response, side effect, laboratory result, or follow-up action is missed.
can be confused because of similarities in their names or packaging. Some medications are designated because an error involving them carries a greater risk of serious harm. These categories help identify hazards; they do not mean that every error involving such a medicine will cause harm.
in medication safety
Medication tasks require people to interpret information, remember steps, perform calculations, communicate across teams, and use equipment. These tasks may be affected by interruptions and time pressure. describes how people interact with tasks, tools, technology, the work environment, and one another.
Fatigue, workload, distractions, confusing labels, poorly designed interfaces, and unclear communication can make predictable mistakes more likely. These conditions can affect performance across the medication-use process.
Slips, lapses, and mistakes
An error in execution occurs when someone intends to do the right thing but performs or omits a step. A is an incorrect action, such as selecting the wrong package while distracted; a is an omitted step. An error in planning is a : the person’s plan or judgment is incorrect, perhaps because information is missing or misunderstood.
The distinction can guide prevention. Reminders or workflow redesign may help prevent slips, while better decision support, information, or training may help address mistakes.
A
A looks beyond the person closest to an event. It examines how the design of work, communication, staffing, storage, technology, and organizational policies shaped the outcome. An error may have several contributing conditions rather than one simple cause.
For example, a clinician selects the wrong medicine from a list containing similarly named products. The order is transmitted without a clear indication, the pharmacy’s verification system does not flag the mismatch, and the product is stored beside its look-alike. The error reaches the patient.
A systems review would examine the selection screen, order details, verification steps, and storage arrangement, rather than only reminding the clinician to be more careful. Such a review can identify changes to protect future patients, including clearer displays, better separation of products, or stronger verification.