If you have a heart or arrhythmia issue, it can be bad - very bad. However, if you're well, it's not bad in moderation
for some individuals.
There's a high quantity of caffeine, some amino acids, and vitamin B in 5-hr Energy drink. The Vitamin B RDA for adults is 25-100 mcg. It's far wiser to get your Vit B from your foods than it is through supplements. I've read that people (10-30%) over 50 yrs of age may have an inability to absorb Vit B easily from foods so supplements of Vit B can help them.
Incidentally, the amount of caffeine listed in 5-Hour Energy is listed at about 207 mg, whereas the avg cup of coffee is about 100-150 mg.
So if you drink a bottle of it, then you just drank 2 cups of coffee in one small bottle..at ONCE! something you might never think of doing in real life.
In a NY Times article 2 yrs ago, 13 deaths were POSSIBLY associated with ingestion of 5-Hr Energy drink. However, it is unclear whether the cause was excess caffeine, Vit B excess and/or a substance called taurine. Another drink associated as a risk is Monster Energy drink.