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Medicines sodium iodide I 123Question & answer

sodium iodide I 123 · Medicine question

Should I stop thyroid tablets before the scan?

iatroX medicinesPublished 21 August 2026Reviewed 21 August 2026

The answer

Answer

Do not stop them yourself. Contact the nuclear medicine team because thyroid and antithyroid medicines can affect the result.

Sources for this answer

Sodium Iodide (123I) Injection 37 MBq/ml solution for injectionemc · SmPC Current selected SmPC · Version 1
NHSNHS · NHS medicine guidance

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sodium iodide I 123

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