I had one. Felt like my heart was going to explode. I think what does the damage is downing the drink in one shot (caffeine punch equal to two cups of coffee) rather than a slow sip the way you would drink strong coffee.

http://abcnews.go.com/Health/hour-energy-drinks-cited-13-deaths/story?id=17725137#.UKVfVO2WdWg

5-Hour Energy Drinks Cited in 13 Deaths

By JIM AVILA (@JimAvilaABC)

Nov. 15, 2012

The federal government and the New York Attorney General’s office are investigating after the Food and Drug Administration received claims that the drink 5-Hour Energy may have led to 13 deaths and 33 hospitalizations over the past four years.

The popular energy shot – which comes in 2 oz. packages and packs a powerful caffeine punch, equal to two cups of coffee — led the way in this new and growing energy drink segment over the past eight years. Now government officials are investigating whether the product, made by Michigan-based Living Essentials, does much more. —->continued