Hello – methimazole starts working right away to block production of *new* thyroid hormone, but you might feel symptomatic until your body burns off its existing stores of excess thyroid hormone, which can typically take a few weeks.
It might give you some additional insight to request hard copies of your labs at each visit and compare where you are to your lab’s “normal” range. Are you right in the middle? At the upper end? The lower end? And where are you compared to your last set of labs? This is the kind of information that can be useful over time.
Hopefully, though, you will start to see some relief soon.
Take care!
Kimberly