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Combined QT risk — GPhC CRA MCQ

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HardDrug InteractionsCombined QT riskGPhC CRA

A 75-year-old woman taking amiodarone is prescribed levofloxacin. She has low potassium from recent diuretic changes. What is the most important interaction to flag?

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Correct answer: E — Raised risk of QT prolongation and arrhythmia

Amiodarone and fluoroquinolones can prolong QT interval. Hypokalaemia further increases torsades de pointes risk. The prescription should be reviewed and electrolytes corrected where needed.

Reference: BNF