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Bladder problems can be a result of the MG itself or the mestinon. What your describing sounds more mestinon related. It can urgency issues. MG itself usually causes nocturia ( frequent need to pee overnight) or overall incontinence .
I researched this myself as I noticed about 40-75 minutes after I take my mestinon I have to go and go now. I noticed also (since I drive for my job longer distances) when sitting in my car it doesn’t bother me as bad, but the minute I get to my location, boom! So I try to time my medicine accordingly, to explain it from a physiological side.
“Acetylcholine sends signals to your brain that trigger bladder contractions associated with an overactive bladder”
Best of luck.