Some of those dental anesthetics are mixtures with adrenaline to make them fast acting. I'm not sure why but lidocaine is on the 'be careful' drug interaction list for MG patients. I gave my dentist this brochure a while ago so he would have good info about MG. The dentist even called my neuro prior to some work I had to have done. A little thing like than made me feel very good about my dentist.

http://www.myasthenia.org/LinkClick....s8%3d&tabid=84