Antacid and levothyroxine — GPhC CRA MCQ
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Correct answer: A — Reduced levothyroxine absorption
Antacids containing aluminium or magnesium can reduce levothyroxine absorption if taken together. This makes reduced levothyroxine absorption the single best answer in this scenario. The other options would either miss the key safety issue, delay appropriate review, or fail to meet the relevant clinical or professional requirement.
Reference: BNF interactions