Originally Posted by
lilwing 
The effects of caffeine are useless in energy drinks and pop and what not, because of the sugar content. If you want real caffeine, take caffeine pills.
Not really. Rockstar + double espresso + 2 Mountain Dews = 160mg + 200mg + 100mg = 460mg caffeine. Average caffeine pill has 100mg of caffeine, so it is the same as about 4.5 caffeine pills
But what is nice about energy drinks is they contain other chemicals besides caffeine such as ginseng and whatnot. Caffeine is a methylated xanthine compound, but energy drinks have other xanthine compounds with methyl groups at other nitrogens that have similar effects