COULD you sue 5 Hour Energy? Sure, you COULD sue them. You wouldn't win, however, unless you were able to show that your diarrhea, nausea, and dizziness were CAUSED by drinking their energy drink - and not by a whole host of other factors: you age, weight, living conditions, eating habits, stress level, exposure to environmental factors, etc.
In order to show that their energy drink caused your symptoms, you'd have to present expert testimony - meaning you'd have to hire an attorney who would agree to take your case. Then, you attorney would have to find a doctor who'd examine you (likely at your cost) and that doctor would have to find that the drink caused your symptoms - and what do you think the odds are of that happening?
Don't waste your time.
You can sue a ham sandwich as they say, but it may not get you that far. If you can prove that this drink caused you serious damages, and the costs of the lawsuit are outweighed by the recovery, than it may be worth pursuing, but it's probably unlikely. However, good luck.
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You have had good advice here about the poor prospects for a lawsuit. But, you can make a complaint to the FDA. You don't need an attorney and it won't cost you anything. Of course, you won't be awarded any damages either, but your experiences will be considered in the government's tracking and assessment of the product.
Here's the link for on-line reporting of a non-emergency:
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