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Simvastatin and clarithromycin — GPhC CRA MCQ

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ModerateDrug InteractionsSimvastatin and clarithromycinGPhC CRA

A patient on simvastatin is prescribed clarithromycin and asks whether muscle aches would matter. What is the most important interaction to flag?

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Correct answer: BClarithromycin increases simvastatin-related myopathy risk

Clarithromycin inhibits metabolism of simvastatin and can increase myopathy or rhabdomyolysis risk. This makes clarithromycin increases simvastatin-related myopathy 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