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Bloomberg Top -- Such top-sellers as Red Bull had 80 milligrams of caffeine per drink, compared with 35 milligrams in a Coca-Cola Classic. Rockstar, another top seller, had 160 milligrams and No Fear had 174 milligrams. Others such as Wired X505 had 505 milligrams per drink, Fixx had 500 milligrams and Cocaine Energy Drink had 280 milligrams.

The researchers said high-caffeine drinks can lead to experimentation or abuse of prescription stimulant drugs such as Ritalin.