Washington (CNN) -- The manufacturers of seven caffeinated alcoholic beverages labeled a "public health concern" have stopped producing or shipping the products, the U.S. Food and Drug Administration announced Wednesday. Last week, the FDA sent warning letters to four beverage makers saying the addition of caffeine to alcoholic beverages was not approved by the agency and it was an "unsafe food additive." The agency said discussions with the companies resulted in these actions: -- Phusion Projects of Chicago, Illinois, has ceased producing caffeinated alcoholic beverages, is no longer shipping such products and expects to have all of its caffeinated alcoholic beverages off retail store shelves by December 13. Phusion Projects is the maker of Four Loko.
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The FDA has called the seven caffeine-alcohol drinks unsafe
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Manufacturers have agreed to stop shipping them, the agency says
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The companies had been given two weeks to reformulate products
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