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Tetracycline and iron — GPhC CRA MCQ

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ModerateDrug InteractionsTetracycline and ironGPhC CRA

A patient prescribed lymecycline for acne buys ferrous sulfate for iron deficiency. He plans to take both with breakfast. What is the most important interaction to flag?

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Correct answer: A — Iron can reduce tetracycline absorption

Iron salts can chelate tetracyclines and reduce absorption, risking reduced antibiotic effect. The doses should be separated according to guidance. Similar counselling applies to antacids and some mineral supplements.

Reference: https://www.pharmacyregulation.org/registration-assessment#stage-8-order-25