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Caffeine intoxication usually occurs with consumption above 250mg (equivalent to about 2 1/2 cups of coffee). Caffeine is a central nervous system stimulant and may be taken to help restore mental alertness when unusual tiredness, weakness or drowsiness occurs. Caffeine's use as an alertness aid should be only occasional. The amount of caffeine in some common foods and beverages is as follows:- Coffee, brewed - 40 to 180mg per cup
- Coffee, instant - 30 to 120mg per cup
- Coffee, decaffeinated - 3 to 5mg per cup
- Tea, brewed American - 20 to 90mg per cup
- Tea, brewed imported - 25 to 110mg per cup
- Tea, instant - 28mg per cup
- Tea, canned iced - 22 to 36mg per 12 ounces
- Cola and other soft drinks, caffeine-containing - 36 to 90mg per 12 ounces
- Cola and other soft drinks, decaffeinated - 0mg per 12 ounces
- Cocoa - 4mg per cup
- Chocolate, milk - 3 to 6mg per ounce
- Chocolate, bittersweet - 25mg per ounce
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