I am getting treatment for primary hypo thyroiditis. I have done FT4 test in 31st Jan 2018 result is 1.370 and again done in 31st May 2018 and results 1.7 ng/dL. Doctor advise me to take 100 mcg thyronorm. But from July onwards, non availability of thyronorm, pharmacist given me T4 100 Montpellier. While using it I am experiencing numb in my fingers in right hand. 1. Why it is happening 2. Can use T4 100 Montpellier instead of thyronorm 100 Mcg IN addition to this issue, I have cartilage issue in my knee legs. Please give your advise to sort out my issues.