Levothyroxine and ferrous sulfate — GPhC CRA MCQ
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Correct answer: A — Reduced levothyroxine absorption
Iron salts can reduce levothyroxine absorption and doses should be separated. In this vignette, "Reduced levothyroxine 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: BNF