Some people are okay with lidocaine, some are not!
Any of the "caines" can make MG worse. Have you used any of them before?
Dental anesthesia: Overview of injectable agents useful for nonsurgical periodontal therapy - Registered Dental Hygienist
You can ask a dentist (if that's why you asked) to use a smaller amount at first to see how things go.
Just make sure that whatever doctor is using an anesthetic is aware of the possible complications/adverse effects of them on MG patients.
https://pdfs.semanticscholar.org/8bb...41b86decfa.pdf
http://www.myasthenia.org/LinkClick....I5LnDa2XVs8%3D
I hope that info helps.
Annie