You realise you gave a patient the wrong dose of a medicine. What is the first thing you should do?

Check on the patient and assess for any effects

Fill in the incident form first

Alter the drug chart to match what you gave

After an error that did not harm the patient, what does the duty of candour require?

Being open and honest with the patient, and apologising

Saying nothing, since there was no harm

Telling only your manager, not the patient

Waiting to see if harm develops before deciding

A ward has repeated errors caused by two similarly packaged drugs. What is the best response?

Report it so the system issue can be addressed, such as separating the drugs

Tell staff to simply be more careful

Ignore it, as no serious harm has occurred

How should a medication error be documented?

Left out of the record to avoid trouble

Recorded as if the correct dose was given

Described vaguely so no one can tell

Why is a blame-free, learning response to errors safer than punishing individuals?

It encourages reporting and lets the real causes be fixed

It means no one is ever responsible

It removes the need for any standards

Part B6 of 8 Improving Safety and Quality of Care Chapter 62 of 75

Medication Error Scenario Questions

NMC CBT medication error practice: patient first, honest reporting, candour, a systems approach, and worked scenario answers.

Start reading ← Back to all parts ~5 min read

By JobLabs Editorial · UK healthcare reference editorial team

· July 16, 2026 · Updated Jul 17, 2026 · 2 min read

Medication errors are among the most common patient safety incidents, and the CBT tests not whether you will ever make one, but how you respond. The right response protects the patient, is honest, and helps prevent the next error.

The patient comes first

The immediate priority after any medication error is the patient. You check on them, assess for effects of the error, and take whatever action keeps them safe, monitoring, seeking medical review, or more. Only once the patient is safe do you move to reporting and documenting. A question that has you fill in the form before checking the patient, or watch quietly to see what happens, is offering the wrong order.

Openness and candour

After that, the response is open and honest. You report the error through the incident system, and you tell the patient what happened, apologise, and explain what will be done. This duty of candour applies even when no harm occurred. Concealing an error, hiding it from the patient because it caused no harm, or altering the drug chart to cover it are all serious breaches. Honesty here is not optional.

Document honestly

The error is recorded honestly and factually, including what happened and the action taken, because the record supports the patient’s ongoing care and the wider learning. Leaving it out, writing it up as if the right dose was given, or being deliberately vague are dishonest and unsafe.

A systems approach

The deeper point the exam tests is why errors are treated as system problems rather than individual failings. Most medication errors are shaped by conditions: interruptions during drug rounds, look-alike drugs and packaging, staffing pressure, poor design. When a ward keeps making the same error because two drugs look alike, the fix is a system change, separating them, adding warnings, not telling staff to try harder or blaming whoever was on shift. Fixing the conditions prevents the next error, which is the whole point of a learning culture. Next: safeguarding adults. Five medication error scenarios first.

Sources & further reading

Key takeaway from Medication Error Scenario Questions

Frequently asked questions

What is the first priority after a medication error?

The patient. You check on them, assess for any effects of the error, and take any action needed to keep them safe, such as monitoring or seeking medical review. Only once the patient is safe do you move on to reporting and documenting.

Do I have to tell the patient about a medication error?

Yes. The duty of candour means being open and honest with the patient about what happened, apologising, and explaining what will be done, even when no harm occurred. Concealing an error breaches candour and damages trust.

Why treat medication errors as system problems rather than just blaming the nurse?

Most errors are influenced by system factors like interruptions, look-alike drugs, staffing and poor design. Blaming the individual hides these causes and stops reporting. A systems approach fixes the conditions that let errors happen, which prevents the next one.

Check your understanding

Quick quiz: Medication Error Scenario Questions

5questions. Click an answer to see the explanation. Your score is saved on this device only.

1
You realise you gave a patient the wrong dose of a medicine. What is the first thing you should do?
The patient's safety comes first: check on them and assess for any effects, taking action such as monitoring or medical review as needed. Reporting and documentation follow immediately after. Hiding the error, or falsifying the chart, is a serious breach.
2
After an error that did not harm the patient, what does the duty of candour require?
Candour applies regardless of harm. You tell the patient what happened, apologise, and explain what will be done. Staying silent because no harm occurred, or hiding it from the patient, breaches the professional duty of candour.
3
A ward has repeated errors caused by two similarly packaged drugs. What is the best response?
Look-alike packaging is a system factor, and reporting it allows a system fix such as storing the drugs apart or adding warnings. Telling people to try harder, or blaming individuals, does not remove the underlying trap and the errors will recur.
4
How should a medication error be documented?
The error is documented honestly and factually, including what happened and what was done, because accurate records support the patient's ongoing care and learning. Omitting it, falsifying the record, or being deliberately vague are all dishonest and unsafe.
5
Why is a blame-free, learning response to errors safer than punishing individuals?
A just, learning culture encourages open reporting so the real, often system-level, causes can be found and fixed, preventing recurrence. It does not mean no accountability, hiding errors, or dropping standards. Fear of punishment, by contrast, drives errors underground.