skip to main content

Theophylline and erythromycin — GPhC CRA MCQ

Instant feedback + full explanation. One question, done properly.

HardRespiratory TherapeuticsTheophylline and erythromycinGPhC CRA

A woman taking modified-release theophylline is prescribed erythromycin and reports nausea with fine tremor. What is the most important interaction to flag?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — Raised theophylline concentration and toxicity risk

Erythromycin can increase theophylline concentrations, and nausea with tremor may indicate toxicity. This makes raised theophylline concentration and toxicity risk 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