Earlier quoted context omitted.
man I wish a red bull worked, I can drink 4 and the only thing I feel is my heart hurting (I don't drink Red Bull any more btw, that heart thing freaks me out)
Red bull is not the strongest energy drink at all. I need to chug 2 of the normal size cans in succession to feel anything at all. Monster and Rock Star are fantastic if you need to keep up physical work but I worry about their effect on my heart after reading about how bad they can be. http://www.reuters.com/article/healthNews/idUSSYD58461200808...
http://www.energyfiend.com/the-caffeine-database
For example (mg caff / oz):
Red Bull = 80 / 8.46
Rockstar = 160 / 16
Coca Cola = 35 / 12
Fixx Energy = 400 / .17