caffeine

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caffeine

(kăfēn`), odorless, slightly bitter alkaloid found in coffeecoffee,
a tree, its seeds, and the beverage made from them. The coffee tree, a small evergreen of the genus Coffea, has smooth, ovate leaves and clusters of fragrant white flowers that mature into deep red fruits about 1-2 in. (1.27 cm) long.
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, teatea,
tree or bush, its leaves, and the beverage made from these leaves. The plant (Camellia sinensis, Thea sinensis, or C. thea) is an evergreen related to the camellia and indigenous to Assam (India) and probably to parts of China and Japan.
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, kola nuts (see colacola
or kola,
tropical tree (genus Cola) of the family Sterculiaceae (sterculia family), native to Africa but now grown in other tropical regions. The fruit is a pod containing seeds from which is obtained caffeine, an alkaloid that functions as a stimulant.
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), ilex plants (the source of the Latin American drink matématé
, yerba maté
, or Paraguay tea,
evergreen tree (Ilex paraguariensis) of the family Aquifoliaceae (holly family). From ancient times Native Americans and now millions of Argentines and others in South America have made a tea (also
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), and, in small amounts, in cocoa (see cacaocacao
, tropical tree (Theobroma cacao) of the family Sterculiaceae (sterculia family), native to South America, where it was first domesticated and was highly prized by the Aztecs. It has been extensively cultivated in the Old World since the Spanish conquest.
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). It can also be prepared synthetically from uric aciduric acid
, white, odorless, tasteless crystalline substance formed as a result of purine degradation in man, other primates, dalmatians, birds, snakes, and lizards. The last three groups of animals also channel all amino acid degradation into the formation of glycine, aspartic
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. While relatively harmless, it is the most commonly used mind-altering drug in the world. When used in moderation, caffeine acts as a mild stimulantstimulant,
any substance that causes an increase in activity in various parts of the nervous system or directly increases muscle activity. Cerebral, or psychic, stimulants act on the central nervous system and provide a temporary sense of alertness and well-being as well as
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 to the nervous system, blocking the neurotransmitter adenosine and resulting in a feeling of well-being and alertness. It increases the heart rate, blood pressure, and urination and stimulates secretion of stomach acids; excessive intake can result in restlessness, insomnia, and heart irregularities. The effects of caffeine vary from person to person, as people excrete it at different rates. Physical dependence and unpleasant symptoms upon withdrawal (headache, fatigue, depression) are common in regular caffeine users.

Bibliography

See B. A Weinberg and B. K. Bealer, The World of Caffeine (2001).

Caffeine

 

a central nervous system stimulant; trimethylxanthine, an alkaloid found in tea leaves, coffee beans, and kola nuts and obtainable synthetically.

Caffeine is administered in tablet form in cases of central nervous system depression, weak cardiac activity, narcotic intoxication, hypotonia, and migraine. A solution of caffeine and sodium benzoate, containing 38 percent pure caffeine and administered subcutaneously, has similar pharmacological properties and indications.

caffeine

[′kaf‚ēn]
(organic chemistry)
C8H10O2N4·H2O An alkaloid found in a large number of plants, such as tea, coffee, cola, and mate.

caffeine

, caffein
a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C8H10N4O2
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He did, however, have a box of caffeine pills in his possession, leading to the conclusion that he was likely suffering from pathologic intoxication.
Hollyoaks (C4) Ste's life has been unravelling before his very eyes of late and that's all down to the fact that Daniel and Abi have been spiking his drinks with caffeine pills to ensure he gets no sleep.
Ste's life has been unravelling before his very eyes of late, and that's all down to the fact that Daniel and Abi have been spiking his drinks with caffeine pills to ensure he gets no sleep.
HOLLYOAKS (C4 & S4C) Ste's life has been unravelling before his very eyes of late, and that's all down to the fact that Daniel and Abi have been spiking his drinks with caffeine pills to ensure he gets no sleep.
In a 1990 episode of the crypto-kiddie-porn high school sitcom Saved by the Bell, Jessie (played by Elizabeth Berkley, later to triumph as a bare-it-all-to-get-ahead dancer in Showgirls) gets hooked on caffeine pills while studying for a big math test and rehearsing for a singing audition.
He added he is drinking plenty of electrolytes before and during practices and is taking caffeine pills before games to help stave off fatigue.
At one point, I was taking sleeping pills, anti-depressants, beta-blockers for stress, caffeine pills to keep me going, and on top of that I was drinking a pile of alcohol to blot it all out.