I do have a specialist but when I called I talked to an intern. Maybe that was the problem. He told me to talk to my headache neurologist. The reply I got from her secretary was that it should not interfere with any of my meds but if I wanted to stop taking it I could. So I am really annoyed that I talked to two neurologists and neither one of them seemed to think magnesium should cause problems. Well I am telling you all that it does. I talked to a nephrologist friend of mine and he said absolutely magnesium could cause problems because it works at the same site as mestinon.