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Antacid and ciprofloxacin — GPhC CRA MCQ

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HardDrug InteractionsAntacid and ciprofloxacinGPhC CRA

A patient taking ciprofloxacin buys magnesium trisilicate mixture. What is the most important interaction to flag?

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

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Correct answer: DReduced ciprofloxacin absorption

Divalent and trivalent cations reduce quinolone absorption. In this vignette, "Reduced ciprofloxacin absorption" is the safest single best answer. The other options are less appropriate because they miss the key clinical risk, conflict with UK medicines guidance, or delay needed review.

Reference: https://www.pharmacyregulation.org/registration-assessment#stage-8-order-85