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You have been detected to overactive thyroid that is thyrotoxicosis which means I presume your T3 and T4 levels are high and rightly advised antithyroid drug.
This drug is generally well tolerated and your Physician is starting with low dose in case...
Thanks for writing to HCM
I think there is confusion at some level.
Your father need anti thyroid drugs like carbimazole or methimazole if he has hyperthyroid symptoms and blood parameters indicate so.
Thyronorm is prescribed in patients with low level of thyroid hormones.
You can consult...