energy drink
any of a group of widely available liquids that may contain large quantities of caffeine as well as sugar, taurine, gingseng, gingko biloba, B vitamins, antioxidants, and artificial sweeteners and that are used to increase energy, alertness, and endurance. Overuse has been associated with agitation, anxiety, insomnia, and arrhythmias. Caffeinated alcoholic beverages are also considered to be energy drinks. In 2010, in response to concerns about the safety of these beverages, the U.S. Food and Drug Administration labeled caffeine an “unsafe food additive” to alcohol and effectively banned its use in alcoholic beverages.