I don't drink them very often but when I do they always make me really fucking ill. I had one this morning and now I can't stop shaking and twitching, my joints are popping and I have a general feeling of tenseness. I think I might be allergic to guarana or taurine, since those two ingredients are common to pretty much every energy drink. Back in August I was hospitalized briefly after having a panic attack that I think was at least partially induced by Red Bull.