Heather, a long time member here, had this chest tightness, could it be a
heart attack, reaction this spring
and her neuro immediately took her off
copaxone and put her through a battery of cardio tests. She was off a dmd for three months or so if I am remembering the timing, waiting to find out if it was safe to take.
If you continue to have this problem, you could always switch to a different DMD.
Welcome again - I hope to see you around.