Potassium supplement and spironolactone — GPhC CRA MCQ
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Correct answer: D — Hyperkalaemia risk
Potassium supplementation with potassium-sparing diuretics can cause dangerous hyperkalaemia. The best answer addresses the key safety, legal or pharmaceutical care issue in the vignette. The other options would either delay appropriate care, create a new risk, or fail to resolve the issue. This is consistent with the cited UK reference for safe pharmacy practice.
Reference: BNF