for a number of years i had been taking tegretol for depression, ...

for a number of years i had been taking tegretol for depression, my dr. then switched me to trileptal suggesting it was a purer form of the same drug, i've been on trileptol for over 3 years now, my face is a mess rash, itching alot of the time , i have never ever had any such problem before, also i am experiencing musle and joint pain, another big one is my hair is thinning loss of condition, my question is can long term rx use be causing too many toxins in my system?