I've used it once. I made sure to drink water before taking it though cause I heard about somebody taking the black 5 hr engery drink that they got dehydrated. Soooo I drank like 3 glasses of wter then wento ut for a night of partying and yea didn't get to bed till like 5 am! LMAO

It was a bachlorette party that started off on a boat that ended up getting all dolled up and partying at club. lol