Drug Interactions and Nursing Safety
Drug interactions occur when one drug alters the effect of another. Nurses must recognise common interactions and take an accurate medication history to prevent harm.
Practice Drug Interactions with PassMate AI →Key Points to Know
What you must know about Drug Interactions
Interactions can be pharmacokinetic (absorption, metabolism) or pharmacodynamic (additive/antagonistic effects).
Warfarin interacts with many drugs and foods (vitamin K-rich greens reduce its effect).
Antacids reduce the absorption of many oral drugs — separate administration times.
Combining CNS depressants (opioids, benzodiazepines, alcohol) increases sedation and respiratory depression.
Grapefruit juice inhibits enzymes and can raise levels of some drugs.
Always take a complete medication history, including herbal and over-the-counter products.
NMCN Exam Tips
How this topic appears in the NMCN exam
A thorough medication and herbal history is the key preventive nursing action.
Warfarin + NSAIDs/aspirin → increased bleeding risk.
Separate antacids from other oral drugs by at least 1–2 hours.
CNS depressant combinations → excessive sedation and respiratory depression.
Practice Question
Test yourself
A patient on warfarin should be advised to maintain a consistent intake of which nutrient because it can alter the drug's effect?
Explanation
Vitamin K (found in green leafy vegetables) antagonises warfarin. Large fluctuations in vitamin K intake alter the INR and warfarin's anticoagulant effect, so intake should be kept consistent rather than avoided completely.
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