From Data to Prescribing Action
Choose and justify the safest treatment change after integrating investigation results with the indication and patient trajectory.
How to prepare for the PSA
Combine patient-centred prescribing judgement with fast BNF navigation, reliable calculations, complete prescriptions and explicit monitoring and communication.
Core concepts
Concept 1
The correct response integrates the data with symptoms, treatment purpose, current dose, timing and competing risks.
Exam cue: State what the data show about efficacy, toxicity or exposure.
Concept 2
No change can be the appropriate decision when results show benefit and acceptable safety; action should not be driven by the mere presence of data.
Exam cue: Compare continuation, dose change, withholding and replacement against the immediate risk.
Concept 3
A concerning result may require immediate withholding or escalation before a definitive long-term regimen is chosen.
Exam cue: Include the next monitoring or escalation step that makes the decision safe.
Risk pitfalls and guardrails
Changing treatment because a value moved without judging whether the change is clinically meaningful.
Guardrail: Do not let a familiar medicine, reference search or calculator output replace patient-specific safety checks and escalation.
Selecting a large dose change when the data support a smaller or temporary action.
Guardrail: Do not let a familiar medicine, reference search or calculator output replace patient-specific safety checks and escalation.
Failing to escalate an urgent result while debating a long-term prescription.
Guardrail: Do not let a familiar medicine, reference search or calculator output replace patient-specific safety checks and escalation.
Memory anchors
Interpret
Describe what the data mean for benefit, harm or medicine exposure.
Act Proportionately
Choose the smallest safe change that addresses the evidence.
No Change
Continue when treatment is effective, safe and appropriately monitored.
Urgent Result
Withhold or escalate immediately when delay creates serious risk.
Close the Loop
Pair the prescribing action with follow-up monitoring and ownership.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A patient on metformin has lactate elevation, acidosis and acute renal failure. What is best?
A patient on anticoagulation has haemoglobin fall and positive faecal occult blood. What is best?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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