One other important thing, is are you taking other medications currently? The University of Illinois college of pharmacy has put together a list of medications that can trigger myasthenia gravis. I have hit a few of these medications, and I had my myasthenia flare. My advice is to consult with http://www.myastheniagravis.org, the link "what makes MG worse" is important, and there you'll find the medication lists, here's a link to it, April 2015
https://dig.pharmacy.uic.edu/faqs/2015-2/april-2015-faqs/