Caffeine (Molecular Formula C8H10N4O2) is a stimulant drug. It is a xanthine alkaloid compound that acts as a psychoactive stimulant and a mild diuretic (at doses higher than 300 mg- see Relative content: comparison of different sources)[2] in humans. The word comes from the French term for coffee, café.[3] Caffeine is also called guaranine when found in guarana, mateine when found in mate, and theine when found in tea; all of these names are synonyms for the same chemical compound.

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