The Energy-Drink Buzz Is Unmistakable. The Health Impact Is Unknown -- NY Times

280 mg caffeine/8oz > 2 * amt. in cup of coffee

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http://select.nytimes.com/search/restricted/article?res=FA0C15F93F550C718DDDAB0994DE404482
THE CONSUMER; The Energy-Drink Buzz Is Unmistakable. The Health Impact Is Unknown.
By MICHAEL MASON
Published: December 12, 2006
Meet Jamey Kirby. If you're young enough, and hip enough, he'd like to sell you some Cocaine... Each 8.4-ounce can of Cocaine contains 280 milligrams of caffeine, more than twice the amount in a cup of coffee, and a throat-numbing blend of fiery spices.... This year, in a study published in the Journal of Analytical Toxicology, a team of researchers analyzed the caffeine content of 10 popular energy drinks and found concentrations as high as 141 milligrams per 16-ounce can. While the Food and Drug Administration does not regulate the amount of caffeine in soft drinks, agency guidelines for colas suggest no more than 68 milligrams per 12-ounce serving....