If you are looking for alternate ways to treat high cholesterol (if that is an issue for you), you might ask your doctors about trying high-dose niacin. When statins did not work for me, this is one of the things we tried in an attempt to treat my high cholesterol years ago, under doctor's recommendation and supervision. You'll need to check with them to see if it is also safe with myasthenia gravis, but it can be an alternative way to lower cholesterol. It does work for some people.

Sending lots of good wishes your way,
Erin