Caffeine. Definition

Medical Definition: Caffeine

A substance found in seeds and leaves of coffee (coffee tree), tea, yerba mate, guarana berries, and in small quantities in cocoa. It can also be made in the laboratory and added to some soft drinks, food and medicine. Caffeine increases brain activity, alertness, attention and energy. It can also increase blood pressure, heart rate, respiratory rate and loss of body water in urine.

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