When I was first diagnosed 1 1/2 years ago, I was reluctant to start taking Sinemet. So, my doctor prescribed Azilect. Although I still take it to this day in addition to my other meds, I have not noticed any benefit. It is supposed to slow down the progression of the disease. It is not meant to control your tremors. That is what Sinemet is for.
Yes, it is very expensive. I get mine from the VA so my cost is only $27 for a 90 day supply. If I had to pay the regular price, I would have stopped taking it a long time ago. Neither my civilian nor my VA neurologists thinks it does much (if anything) but, they don't recommend that I stop taking it.