Hypothyroidism Treatment More Condition_symptoms I Need To Know About Drug Treatment For Hypothyroidism.?

I need to know about drug treatment for Hypothyroidism.? - hypothyroidism treatment more condition_symptoms

Hello. My brother is a child with Down syndrome and has been shown that hypothyroidism. He was 14 The doctor suggested that the thyroxine treatment, they say the test with a very low dose is started. I wonder (especially someone who is subjected to this treatment) side effects and consequences. I would also like to know how long the treatment is carried out and what the benefits are visible. Thank you.