An 8.3-ounce can of Red Bull contains 80 milligrams of caffeine, about the same amount of caffeine as in a cup of coffee. By comparison, Coca-Cola contains about 34 milligrams of caffeine per 12 ounces. Full Throttle energy drink contains 144 milligrams of caffeine per 16-ounce serving, while 16 ounces of Rockstar contain 150 milligrams of caffeine.

For a healthy adult, 200 to 300 milligrams of caffeine a day is considered a moderate amount, according to the American Dietetic Association.

Some cool info buried in an standard "oh won't someone think of the children" article.

I consume way more than 5 red bulls in 30 days.

ABC News: Red Bull Not the Best Mixer