Methimazole
"I'm taking methimazole for about 4 months and already experienced side effects.  I have a very bad burning in my tongue and mouth. My teeth have become very sensitive and I have headaches every day. I told my doctor 2 times about this. He just runs the same tests on me and he finds nothing. I think is this medicine that's making all of this, but he just doesn't listen. I need help cause this side effects are killing me!!!!"