|Molar mass||194.19 g/mol|
|Appearance||Odorless, white needles or powder|
|Density||1.23 g/cm3, solid|
227–228 °C (anhydrous); 234–235 °C (monohydrate)
178 °C subl.
|Solubility in water||2.17 g/100 ml (25 °C)
18.0 g/100 ml (80 °C)
67.0 g/100 ml (100 °C)
|Dipole moment||3.64 D (calculated)|
|EU classification||Harmful (Xn)|
|LD50||192 mg/kg (rat, oral)|
(what is this?) |
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
|Product||Serving size||Caffeine per serving (mg)||Caffeine per liter (mg)|
|Caffeine tablet (regular-strength)||1 tablet||100||—|
|Caffeine tablet (extra-strength)||1 tablet||200||—|
|Excedrin tablet||1 tablet||65||—|
|Hershey's Special Dark (45% cacao content)||1 bar (43 g; 1.5 oz)||31||—|
|Hershey's Milk Chocolate (11% cacao content)||1 bar (43 g; 1.5 oz)||10||—|
|Percolated coffee||207 mL (7 U.S. fl oz)||80–135||386–652|
|Drip coffee||207 mL (7 U.S. fl oz)||115–175||555–845|
|Coffee, decaffeinated||207 mL (7 U.S. fl oz)||5-15||24-72|
|Coffee, espresso||44–60 mL (1.5-2 U.S. fl oz)||100||1691–2254|
|Black tea||177 mL (6 U.S. fl oz)||50||282|
|Green tea||177 mL (6 U.S. fl oz)||30||169|
|Coca-Cola Classic||355 mL (12 U.S. fl oz)||34||96|
|Mountain Dew||355 mL (12 U.S. fl oz)||54.5||154|
|Jolt Cola||695 mL (23.5 U.S. fl oz)||280||402|
|Red Bull||250 mL (8.2 U.S. fl oz)||80||320|
|Buckfast Tonic Wine||750 mL||281.25||375|
|LiveWire Energy chew / fruit||1 chew||90||n/a|
|LiveWire Energy chew / Choc.||1 chew||100||n/a|
|LiveWire Energy chew / Mint Choc.||1 chew||120||n/a|
Caffeine is the main drug that is in coffee. Coffee comes from a tree. The seeds of the tree are roasted to make coffee.
Caffeine comes from other plants as well. It is found in guarana, yerba maté, cacao, and some plants used to make tea. The plants use caffeine as a pesticide. This is a chemical that kills insects if they eat the plant. It is the way the plant protects itself.
The biggest use of caffeine is as a stimulant. People drink coffee and other drinks with caffeine to stay awake.
Doctors sometimes use caffeine as a medicine. It is used for headaches (head pain). It is sometimes used to help premature (born very early) babies to breathe. The short-term risk of this treatment seems to be that the babies treated gain less weight than usual.
In the beginning caffeine was found to relieve hunger, so it was used for weight loss. That did not last because people were using too much. Caffeine can be a very dangerous drug when not used in the right way.
Caffeine also has medicinal properties. It is used in many over the counter medicines, such as Excedrin, Midol and Anacin. When combined with other analgesics, caffeine can help to alleviate headaches and cramps.
The largest problem with caffeine is addiction. This is when people get bad symptoms when they do not have the drug. When people have withdrawal (feel bad because they do not have the drug) they drink more. This makes them feel better. But if they cannot get more, they are likely to feel some of the symptoms listed below:
Caffeine can also hurt people if they drink very much at once. If someone takes very much of a drug at once it is called an overdose. Caffeine overdose is a medical diagnosis. It is called:Caffeine-Induced Organic Mental Disorder or Caffeine Intoxication. People with this can have these symptoms:
250-300 mg of caffeine a day is a moderate amount. That is as much caffeine that is in three cups of coffee (8oz each cup). More than 750-1000mg a day is dangerous, but people who drink more coffee every day can drink more without getting sick. The Lethal Dose 50 of caffeine is 192 mg per kilogram, in rats. In humans, it is between 150 and 200 mg per kilogram.
Caffeine is in many drinks and foods. This is approximate amounts of caffeine in some food and drink:
One ounce – abbreviated oz - is 30ml.
A 'cup' is 8 oz (240ml.)
|In general, each of the following contains approximately 200 milligrams of caffeine:
A fluid ounce is between 28 and 30 mililitres.
a. There may also be large amounts of other chemicals, similar to caffeine in Chocolate and other products of cacao. There is theobromine in cacao, for example. These substances can have effects similar to those of caffeine.
b. Most tea drunk in North America is not very strong. The figures are for this kind of tea. The tea drunk in most other places of the world is stronger; for these kinds of tea, the figures are probably too small.
Here are sentences from other pages on Caffeine, which are similar to those in the above article.