A community pharmacy’s error log shows that most dispensing errors last quarter involved selecting the wrong strength of the right drug (e.g., hydroxyzine 25 mg filled instead of 50 mg) from adjacent shelf stock. Which intervention would most reliably prevent this type of error?

Barcode scanning of each stock bottle against the prescription

Tall Man lettering on the shelf labels of the affected products

Moving each strength of the affected drugs to a separate shelf

Staff education on the error pattern at the next team meeting

In a pediatric emergency department, a 3-year-old received 2.2 times the intended acetaminophen dose because the child’s weight was recorded as 31 lb but entered into the weight-based dosing field as 31 kg. Which practice would best prevent a recurrence?

Weigh and record pediatric weights in kilograms only

Require a second nurse to re-weigh the child at every visit

Round all weight-based oral liquid doses to the nearest whole mL

Display each weight in both pounds and kilograms in the EHR

A health system finds that most of its inpatient opioid-related oversedation events occur within 24 hours of starting IV PCA in opioid-naive postoperative patients, many of whom have obstructive sleep apnea. Which system-level intervention most directly targets these events?

Opioid-naive PCA order sets without a basal rate

A pain service consultation before any IV opioid order

Naloxone stocked in every automated dispensing cabinet

Annual nurse education on opioid sedation

A medication safety committee is reviewing which CPOE alerts should be hard stops (cannot be overridden) rather than soft alerts. For which situation is a hard stop most appropriate?

Intrathecal route selected for vincristine

Duplicate PPI orders for the same patient

A dose 10% above the usual adult range

A moderate interaction between two prescribed drugs

A hospital reviews two heparin infusion errors in one month. In both, a nurse programmed the pump for 25,000 units/500 mL when the bag hung was 25,000 units/250 mL, because both premixed concentrations are stocked on the units. Which intervention would most effectively prevent a recurrence?

Stock a single standard heparin premix concentration

Retrain nurses on heparin rate calculations

Add a heparin concentration warning sticker to each bag

Require an independent double check of every heparin bag

A hospital finds that prescribers override 95% of drug–drug interaction alerts in its CPOE system, and two serious interactions were recently missed after the alerts were overridden. Which change is most likely to improve medication safety?

Tier alerts so only high-severity interactions interrupt

Add moderate-severity interactions to increase sensitivity

Turn off interruptive interaction alerts in CPOE

Require a free-text override reason for every alert

A hospital reports a near miss in which a nurse prepared to give concentrated potassium chloride 2 mEq/mL by IV push after taking a vial from floor stock. Which intervention would most effectively prevent this type of event?

Remove concentrated KCl vials from patient care units

Store the vials in a locked bin on each unit

Apply red ‘Must be diluted’ auxiliary labels to every vial

Require two-nurse verification before any KCl is given

A hospital’s ADE review finds repeated enoxaparin 1 mg/kg every 12 hours orders for patients with CrCl below 30 mL/min. Which CPOE clinical decision support intervention would most effectively prevent these errors?

A dose check using the latest CrCl at order entry

A weekly pharmacist report of renally adjusted orders

A passive monograph link on the enoxaparin order screen

An annual prescriber education module on renal dosing

BCPS Medication Safety: The Error Prevention Hierarchy

1The hierarchy, strongest first

Order follows ISMP’s hierarchy of effectiveness for error-reduction strategies. Examples are general and not taken from the cases below.
Strategy	How it works	Example
Forcing functions and constraints	The wrong action cannot be completed	Enteral syringes and connectors that cannot attach to an IV line
Automation and computerization	A system checks or acts without relying on memory	Smart infusion pumps with dose-error-reduction limits
Standardization and protocols	Fewer variations leave fewer wrong choices	Order entry that defaults oral methotrexate to a weekly schedule
Checklists and independent double checks	A second look, useful only when truly independent	Two clinicians separately calculating a high-alert infusion
Rules and policies	Tell people what to do and depend on compliance	A do-not-use abbreviations list
Education and information	Raises awareness that fades with time and turnover	An in-service after an event

The weekly methotrexate default follows ISMP’s Targeted Medication Safety Best Practices for Hospitals, which also address neuromuscular blocking agents and oral liquid measurement (as of October 27, 2026).

2Why the bottom rungs keep failing

Education, policies and warning labels all depend on someone noticing the hazard at the right moment, under workload and interruption. They help as support. An event review that ends with retraining, though, has usually picked the weakest fix available. These topics make up medication safety and practice management on this site.

Independent double checks sit in the middle for a reason. Two people reading the same screen or label tend to share its blind spot, so a check earns its place only when each person works the problem separately.

2.1Decision support cuts both ways

Clinical decision support (CDS) belongs on the automation rung only when it is specific to the patient; an alert that fires for everything teaches people to click through it. The same tools can catch omissions as well as errors of commission, for example a discharge order set that prompts for each missing pillar of guideline-directed medical therapy (GDMT) for heart failure.

3Words the safety literature uses precisely

Medication error: A preventable event at any step from prescribing to monitoring that may lead to inappropriate use or harm, whether or not harm occurs.
Adverse drug event (ADE): Harm caused by a medication. It may follow an error (preventable) or occur with correct use, as an adverse drug reaction.
Near miss: An error caught before it reached the patient; as informative as an event and cheaper to learn from.
High-alert medication: A drug with a heightened risk of significant harm when used in error. ISMP keeps a list for acute care settings.
Root cause analysis (RCA): A look back at an event to find the system causes behind the person who made the last move.
Failure mode and effects analysis (FMEA): A look forward at a process to find where it could fail before anyone is harmed.

4Questions to ask before choosing a fix

At which step did the error happen: prescribing, transcribing, dispensing, administering or monitoring?
Could the wrong action be made physically or electronically impossible?
Is there a needless variation in products or order formats that could be removed?
Would the check be automated, or would it rely on a busy person?
Does the fix add work, alerts or workarounds that will wear it down?
How will you know it worked: which measure, and by when?

5Pick the strongest fix

Find the step that failed first. The answer is the strongest fix aimed at that step, which is not always the strongest fix on offer.

Study cases written by our editors, not BPS items. The real BCPS exam is computer-based multiple choice, answered in order with no going back.

Case 1 of 8 · 0 answered

How case rounds work

Pick an option to see the verdict and a note on every option. Keys while the round has focus: 1–5 or A–E answer, ← → move between cases. Nothing is saved or sent anywhere.

Case 01
A community pharmacy’s error log shows that most dispensing errors last quarter involved selecting the wrong strength of the right drug (e.g., hydroxyzine 25 mg filled instead of 50 mg) from adjacent shelf stock. Which intervention would most reliably prevent this type of error?
Pick an option: the verdict and a note on every option open here.
Best answer: A.
Barcode verification is an automated check that catches wrong-drug and wrong-strength selection at the moment of filling, so it ranks high on the ISMP hierarchy of effectiveness. Separating stock and relabeling shelves are weaker cues that still rely on human vigilance, and Tall Man lettering targets look-alike drug names rather than strength mix-ups. Education alone is the least effective tier.
A
Correct. Barcode scanning checks the stock bottle against the prescription at the moment of filling, catching wrong-strength picks automatically.
B
Tall Man lettering targets look-alike drug names, not two strengths of the same drug.
C
Separating shelves is a weaker cue that still relies on the person picking the right bottle.
D
Education alone is the least effective tier on the hierarchy of interventions.
Case 02
In a pediatric emergency department, a 3-year-old received 2.2 times the intended acetaminophen dose because the child’s weight was recorded as 31 lb but entered into the weight-based dosing field as 31 kg. Which practice would best prevent a recurrence?
Pick an option: the verdict and a note on every option open here.
Best answer: D.
ISMP and pediatric safety groups recommend that scales read and weights be recorded only in kilograms, which removes the lb-to-kg conversion that caused this error. Showing both units keeps pounds in the workflow and still allows the wrong value to be entered into the dosing field. A second weight check adds a human step that does not address the unit mix-up, and rounding doses can itself create dosing errors in small children.
A
Re-weighing adds a human step but does not stop pounds from being typed into a kilogram field.
B
Rounding doses does nothing about the unit mix-up and can create its own errors in small children.
C
Showing both units keeps pounds in the workflow, so the wrong value can still be entered.
D
Correct. Weighing and recording in kilograms only removes the pound-to-kilogram conversion that caused this overdose.
Case 03
A health system finds that most of its inpatient opioid-related oversedation events occur within 24 hours of starting IV PCA in opioid-naive postoperative patients, many of whom have obstructive sleep apnea. Which system-level intervention most directly targets these events?
Pick an option: the verdict and a note on every option open here.
Best answer: C.
A continuous basal PCA infusion in opioid-naive patients, especially those with sleep apnea, raises the risk of respiratory depression, so order-set defaults that remove the basal rate and use naive-patient doses prevent the event at its source. Stocking naloxone matters for rescue but treats oversedation after it happens. A mandatory pain consult for every IV opioid order delays analgesia and does not scale, and periodic education is a weak, short-lived intervention.
A
A mandatory consult before every IV opioid order delays analgesia and does not scale.
B
Naloxone rescues oversedation after it happens rather than preventing it.
C
Correct. A basal infusion in opioid-naive patients, many with sleep apnea, drives early oversedation; order sets without one prevent it.
D
Yearly education is a weak, short-lived intervention compared with changing the default order.
Case 04
A medication safety committee is reviewing which CPOE alerts should be hard stops (cannot be overridden) rather than soft alerts. For which situation is a hard stop most appropriate?
Pick an option: the verdict and a note on every option open here.
Best answer: A.
Hard stops are reserved for errors that are never clinically justified and are catastrophic; intrathecal vincristine is uniformly fatal, so the route should be blocked outright. Moderate interactions, therapeutic duplications, and modest dose excursions sometimes have legitimate clinical reasons, so they suit soft, overridable alerts. Overusing hard stops delays care and encourages workarounds.
A
Correct. Intrathecal vincristine is uniformly fatal and never justified, so a hard stop that cannot be overridden fits.
B
Duplicate PPI orders are occasionally intended and suit a soft, overridable alert.
C
A dose slightly above the usual range can be clinically justified, so a soft alert is appropriate.
D
Moderate interactions are often accepted with monitoring and suit soft alerts, not hard stops.
Case 05
A hospital reviews two heparin infusion errors in one month. In both, a nurse programmed the pump for 25,000 units/500 mL when the bag hung was 25,000 units/250 mL, because both premixed concentrations are stocked on the units. Which intervention would most effectively prevent a recurrence?
Pick an option: the verdict and a note on every option open here.
Best answer: B.
Standardizing to one concentration removes the opportunity for the error, a strong standardization strategy on the ISMP hierarchy of effectiveness and part of the Joint Commission anticoagulation safety expectations. Independent double checks are tempting but are weaker human-based checks that miss errors when both staff share the same assumption. Retraining and warning labels rely on memory and vigilance and are the least reliable interventions.
A
Retraining relies on memory and vigilance, the weakest tier of error prevention.
B
Correct. One standard concentration removes the chance of mismatching bag and pump, a strong standardization fix.
C
Warning stickers are a passive cue that busy staff learn to overlook.
D
Double checks often fail when both nurses share the same assumption about the bag.
Case 06
A hospital finds that prescribers override 95% of drug–drug interaction alerts in its CPOE system, and two serious interactions were recently missed after the alerts were overridden. Which change is most likely to improve medication safety?
Pick an option: the verdict and a note on every option open here.
Best answer: B.
Very high override rates signal alert fatigue, so limiting interruptive alerts to high-severity, clinically meaningful interactions (with lower tiers shown passively) restores the signal value of the alerts that matter. Adding more alerts worsens fatigue, and requiring free text for every alert adds burden without making alerts more specific. Turning off interruptive alerts removes a needed safeguard against serious interactions.
A
More low-value alerts would deepen alert fatigue rather than fix it.
B
Correct. A 95% override rate signals alert fatigue; interrupting only for high-severity interactions restores attention to those that matter.
C
Removing interruptive alerts strips away a needed safeguard against serious interactions.
D
A free-text reason on every alert adds burden without making the alerts more meaningful.
Case 07
A hospital reports a near miss in which a nurse prepared to give concentrated potassium chloride 2 mEq/mL by IV push after taking a vial from floor stock. Which intervention would most effectively prevent this type of event?
Pick an option: the verdict and a note on every option open here.
Best answer: A.
Removing concentrated KCl from patient care areas and dispensing only premixed, pharmacy-prepared products is a forcing function that makes IV push of the concentrate impossible; it is a long-standing Joint Commission and ISMP recommendation. Auxiliary labels and separate storage are weaker cues that still leave the vial within reach. Two-person verification is a human check that can fail when both nurses share the same misunderstanding.
A
Correct. Taking concentrated KCl off the units and supplying premixed bags is a forcing function that makes IV push impossible.
B
A locked bin still leaves the concentrate within reach of the unit.
C
Auxiliary labels are weak cues that still rely on the nurse noticing them.
D
Two-person checks can fail when both nurses share the same misunderstanding.
Case 08
A hospital’s ADE review finds repeated enoxaparin 1 mg/kg every 12 hours orders for patients with CrCl below 30 mL/min. Which CPOE clinical decision support intervention would most effectively prevent these errors?
Pick an option: the verdict and a note on every option open here.
Best answer: D.
A patient-specific dose-range check that pulls the current CrCl and suggests 1 mg/kg once daily when CrCl is below 30 mL/min reaches the prescriber at the moment of decision, the hallmark of high-leverage CDS. A monograph link is passive and rarely opened. Retrospective weekly reports catch errors after doses have been given, and annual education is a weak, short-lived intervention.
A
A weekly report finds errors after the doses have already been given.
B
A passive link is rarely opened and does not interrupt an unsafe order.
C
Annual education is weak and fades quickly.
D
Correct. A dose check that pulls the latest CrCl at order entry reaches the prescriber at the moment of decision.

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