Hi, I have been taking carbinzole for a number of years now. I have suffered at various times with extreme hyperthyroidism symptoms but this last year things have got a little better. I had been taking a daily dose of 15mg of Carbinzole for a few months and my reading were Tsh 4.3 so my GP reduced to 10 mg per day. After a few months I became hyper again so the dose went back to 15 mg daily. Tsh elevated to 4.3 so my dose was revised again to 15 mg and 10 mg on alternative days which give the levels of Tsh 2.7. This was Oct 2017' I remained on the same dosage and have just has a blood test 8th Jan 2018 and my levels are Tsh 1.68 T4 9.6. My GP has advised me to decrease the carbinzole dose to 10mg per day and I am now concerned that I will become hyper again. I did question this decision but was told this was the right thing to do. I am due another blood test in 6weeks. Can anyone advise if I should be feeling concerned or just do what I'm instructed by the GP and see what happens.. Many thanks.