Caffeine content of energy drinks varies from 50 milligram to more than 500 milligram per serving.
An ordinary 12-ounces of Coca-Cola contains about 35 milligram of caffeine,and a 6-ounce cup of brewed coffee contains 80-150 milligram caffeine.
Some energy drinks containing caffeine equivalent to 14 cans of Coca-cola.
Caffeine poising is a common clinical syndrome.
It is characterized by nervousness,anxiety,restlessness,insomnia,acid reflux,tremor or rapid heartbeat.
Alcohol brings a new level of danger.
Caffeine in high doses can give users a false sense of alertness.
Traditional beverages,which contain moderate amounts of caffeine,are often smaller than those found in the beverages from the coffeehouse