How long does the Rockstar Energy drink stay in your system

Energy drinks contain large doses of caffeine and sugar in them. And can contain other stimulants such as ephedrine, guarana, and ginseng to mention a few. Energy drinks can have certain effects on our body like raising our blood pressure, making our heart rate rise, and energy drinks can prevent us from getting the sleep that we need. Lasts for a couple hours. ChaCha! [ Source: http://www.chacha.com/question/how-long-does-the-rockstar-energy-drink-stay-in-your-system ]