There were 3 or 4 news reports over the last few years of people dieing shortly after drinking 1 or 2 cans, red bull denied it was because of the drink and it was never proven. If it starts your heart racing and you have a weak heart...who knows, maybe it can kill you, then again so can chocolate but I think you have to eat about 10 pounds of it.
It's an energy drink in Australia, not sure if it's available in other parts of the world. It's a whole lot "sweeter" and somewhat sour than Red Bull is.