Energy drinks and their side effects, do you drink an energy drink daily?

Do you drink an energy drink daily? If so what brand? What side effects could it cause?

I used to drink 'Rockstar' daily 3 or 4 cans untill I found out that taurine in them can cause sometime of mental ilness. According to a Russian TV channel. So I don't drink it anymore.
Energy drinks and their side effects, do you drink an energy drink daily?
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