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Your T3, T4 and TSH values are within normal limits that is the reason no drug is prescribed to you.
If there is any Hypothyroidism
is suspected clinically the thyroid function must be repeated after 2-3 months.
You can take iodized salt in diet to avoid any iodine deficiency
If you are taking any drug which can affect Thyroid function you should consult your physician about this. Some common drugs are amiodarone, Rifampicin
, and mood elevator like Lithium.
Nothing much can be done if cause is autoimmune one.
Hope this helps.
Dr. Akhilesh Dubey M.D.