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Citalopram QT risk — GPhC CRA MCQ

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ModerateCNS TherapeuticsCitalopram QT riskGPhC CRA

A patient taking citalopram 40 mg daily is prescribed erythromycin and has a previous prolonged QT interval. What is the most important interaction to flag?

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Correct answer: E — Additive QT prolongation

Citalopram and erythromycin can both prolong QT interval, increasing arrhythmia risk. This makes additive qt prolongation the single best answer in this scenario. The other options would either miss the key safety issue, delay appropriate review, or fail to meet the relevant clinical or professional requirement.

Reference: BNF interactions