Honestly, DO NOT FUCK WITH ENERGY DRINKS.
This might be the SPAM forum, but I will tell you seriously, they are not to be taken lightly...
I used to drink a lot of energy drinks all the time (over 2000mg's of caffiene a day) until one day, I thought I was having a heart attack...Turns out it was just a panic attack. They have not gone away even years later and they are probably one the worst things next to dieing...Considering that you actually think you are dieing, every single time you have one. I can barely drink a cup of coffee now with out having a panic attack. I can't really smoke weed unless I smoke it constantly.
Energy drinks will fuck you up.
oh and incase you don't know what a REAL panic attack is (not this pussy "anxiety attacks") Your fingers and hands go numb, you get intense chest pains, your knees eventually go knub, you have a very real feeling of death (the "you're going to die feeling"), you feel like you're not taking in enough air, even when you are taking in more than enough (which is one of the reasons why paper bags works, besides steadying your heart rate, it shows you that you are indeed taking in oxygen) and when you get as used to them as you can get used to something like that. You don't go to a hospital, which is bad in the long run, because when you actually need to, you think it's just a panic attack. Which leads to more panic attacks and your health gets worse because you ignore real problems. If you do go to the hospital for every panic attack, they eventually don't take you seriously and the above happens but instead, they think you are crying wolf again.
Also, if you're a teenager - mid twenties person, it is really hard to get medication to control them, because the doctors think you are fishing for drugs.