Hi,
Thyronorm is a tablet which is replacing your thyroid hormone level and even if your levels have come to normal, they are normal due to the drug and not naturally so more or less thyroid hormone replacing drug are life long and leaving the drug will slowly bring you back towards the same hypothyroid levels(you should be taking the drug).
That is a good news that your levels have tested normal, now your doctor might try to bring the dose down and settle you to a lower dose than earlier but ...
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