US Food and Drug Administration issued a warning letter against four companies that add caffeine to their malt alcohol drinks. Caffeine is considered as unsafe food additive for alcoholic beverages:
The four companies are:
Charge Beverages Corp.: Core High Gravity HG Green, Core High Gravity HG Orange, and Lemon Lime Core Spiked
New Century Brewing Co., LLC: Moonshot
Phusion Projects, LLC (doing business as Drink Four Brewing Co.): Four Loko
United Brands Company Inc.: Joose and Max
What are the possible effects of caffeine and alcohol combination?
According to data and expert opinion, caffeine can mask sensory cues that people may rely on to determine how intoxicated they are. This means that individuals drinking these beverages may consume more alcohol—and become more intoxicated—than they realize. At the same time, caffeine does not change blood alcohol content levels, and thus does not reduce the risk of harms associated with drinking alcohol.
Studies suggest that drinking caffeine and alcohol together may lead to hazardous and life-threatening behaviors. For example, serious concerns are raised about whether the combination of alcohol and caffeine is associated with an increased risk of alcohol-related consequences, including alcohol poisoning, sexual assault, and riding with a driver who is under the influence of alcohol.