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Levothyroxine absorption — GPhC CRA MCQ

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HardEndocrine TherapeuticsLevothyroxine absorptionGPhC CRA

A patient taking levothyroxine 100 micrograms daily has started calcium carbonate chewable tablets. They ask whether both can be taken with breakfast. TSH was stable last month. What would you advise the patient?

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

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Correct answer: C — Separate calcium and levothyroxine administration by several hours

Calcium salts can reduce levothyroxine absorption and affect thyroid control. Separating administration reduces the interaction risk. Stopping levothyroxine or taking repeated extra doses would be inappropriate.

Reference: BNF