Thyroxine reduction

Hi,

I've been on 100mcgs of thyroxine for the past 20 years but now the go has said that I need to reduce this to 75 mcgs as my test results are as follows.

My question is will I go too hypothyroid again then or should I maybe drop to around 100mcgs one day and 75mcgs the next?just worried about feeling all the tiredness coming back again if I go too low,thanks

T4-25.4 and TSH-0.13

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