Four Loko is a line of alcoholic beverages, originally marketed as energy drinks, sold by Phusion Projects of Chicago, Illinois. Phusion operates as Drink Four Brewing Company. Four Loko, the company's most popular beverage, debuted in the United States market in 2005. It is now sold in 48 states, and in Canada, The Bahamas and Europe. The name "Four" is derived from the original energy drink's four main ingredients: alcohol, caffeine, taurine, and guarana.
Four branded products have been the object of legal, ethical, and health concerns related to the company allegedly marketing them to the underaged and the purported danger of combining alcohol and caffeine. After the beverage was banned in several states, a product reintroduction in December 2010 removed caffeine, taurine, and guarana as ingredients, and the malt beverage is no longer marketed as an energy drink.