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Erythromycin QT — GPhC CRA MCQ

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HardDrug InteractionsErythromycin QTGPhC CRA

A patient taking citalopram 40 mg and amiodarone is prescribed erythromycin. What is the most important interaction to flag?

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Correct answer: D — Erythromycin may add QT-prolongation risk with citalopram and amiodarone

Combining QT-prolonging medicines increases arrhythmia risk. In this scenario, the pharmacist should prioritise safe supply, appropriate counselling and timely referral or clarification where needed. This is the single best answer because the other options would either delay assessment, ignore a clinically significant risk, or create an unsafe legal or professional outcome.

Reference: BNF