No, I've never had that kind of reaction.

I think it might be worth it to be evaluated by an endocrinologist. I love the neuroscience for kids site.

http://faculty.washington.edu/chudler/chnt1.html

This is interesting (look at the bottom). I can't find my favorite website! When I do, I'll post it.

http://ocw.mit.edu/ans7870/SP/SP.236.../drugchart.htm
http://www.brainexplorer.org/neurolo...smitters.shtml

The body is complex. I really think seeing an endo would be the most useful. Your primary doctor can run some basic tests, like a morning, fasting comprehensive metabolic panel. But an endo would have to do more complicated tests like catecholamines. If you have an imbalance of a hormone in your body, Mestinon might be just "highlighting" it.

Another thought would be that you are allergic to something in it but you don't mention any allergic type symptoms other than heart rate.

Suddenly, You need to get to your doctor right away for an endo referral. A low blood sugar is just as harmful as a high one. If you have essential hypoglycemia (low blood sugar), then you might have a small tumor or other endocrine problem. It could be reactive hypoglycemia. That's often where you eat too big of a meal or eat meals too high in carbohydrates without enough opposing proteins and the body goes from a high glucose and plummets down to a low one. Please ask to see an endocrinologist!

Ditto on what Abby said. I think Mestinon might just be bringing something else to your attention. Who knows. Just see a doctor, even if that isn't fun!

Annie