Adverse Effects, Interactions and Toxicology
Recognise medicine harm, poisoning syndromes and interaction mechanisms, then stabilise and use antidotes appropriately.
How to prepare for MRCP(UK) Part 1
Use the official likely question distribution to plan breadth, then connect mechanisms, patterns and investigations to one most appropriate answer.
Core concepts
Concept 1
Suspected toxicity requires ABCDE, exposure history, toxidrome, investigations and time-sensitive specialist advice.
Exam cue: Treat physiological danger before pursuing exact agent identification.
Concept 2
Adverse drug reactions are assessed through timing, phenotype, dechallenge, competing causes and known risk.
Exam cue: Separate pharmacodynamic from pharmacokinetic interaction.
Risk pitfalls and guardrails
Delaying supportive care while waiting for a drug level.
Guardrail: Do not select an option merely because it is true; choose the one that best answers the exact stem and fits the full pattern.
Restarting a suspected medicine without reviewing causality and alternatives.
Guardrail: Do not select an option merely because it is true; choose the one that best answers the exact stem and fits the full pattern.
Memory anchors
What comes first in poisoning?
ABCDE, glucose, ECG when relevant, supportive care and early toxicology guidance.
What is a pharmacokinetic interaction?
One medicine changes another's absorption, distribution, metabolism or elimination.
What is a pharmacodynamic interaction?
Medicines have additive, opposing or synergistic physiological effects without changing concentration.
What makes an antidote appropriate?
A compatible exposure or syndrome, indication, timing and benefit greater than treatment risk.
What follows serious medicine harm?
Stop or modify treatment, treat the reaction, document clearly, report when required and prevent re-exposure.
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 develops wheeze, hypotension and widespread urticaria minutes after intravenous antibiotic administration. What is the first-line treatment?
A 23-year-old woman presents 8 hours after a large paracetamol ingestion. She feels well and initial liver tests are normal. What is the most important next step?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”