Yes, most of the time western doctors/physicians prescribe drugs based on thyroid symptoms and actual thyroid blood test results. To change the dosage of thyroid drugs would help the doc to know how much dosage is effective to the case. Thats why dosage goes up&down or medicine type changes...
Perhaps you can try what i have taken almost 1year called HealthGuard T18. I am now on my 5th thyroid treatment of such. No sideeffect as all natural herbs approved by singapore. I bought online. I can have my free consultation& health advice though online but the advicer & health team there indeed are all good!!
forgot the url: firstname.lastname@example.org (this is the consultant i used to contact. u can ask him your case.)
Get well soon~