Doxycycline with antacid — GPhC CRA MCQ
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Correct answer: D — Magnesium antacids can reduce doxycycline absorption
Divalent and trivalent cations can bind tetracyclines and reduce absorption. 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