It can cause hoarseness in the voice, coughing and choking on food, slurring of speech, extreme muscle weakness,
blurred or double
vision, droopy eyelids, and the most severe thing is called: A MG crisis. It's when your chest muscles are so weakened that you can't breathe. Then, it's an emergency. Oh well, just trying to help answer your last question. Remember though, I'm not a doctor. Just what I say I am: grannymusiclover.