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acetyl derivative of salicylic acid (see salicylatesalicylate
, any of a group of analgesics, or painkilling drugs, that are derivatives of salicylic acid. The best known is acetylsalicylic acid, or aspirin. Now often made synthetically, they were originally derived from salicin,
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) that is used to lower fever, relieve pain, reduce inflammation, and thin the blood. Common conditions treated with aspirin include headache, muscle and joint pain, and the inflammation caused by rheumatic fever and arthritis. Aspirin is believed to act against fever, pain, and inflammation by interfering with the synthesis of specific prostaglandinsprostaglandin
, any of a group of about a dozen compounds synthesized from fatty acids in mammals as well as in lower animals. Prostaglandins are highly potent substances that are not stored but are produced as needed by cell membranes in virtually every body tissue.
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 in the body. Because of its ability to inhibit the formation of blood clots, aspirin is also used in low doses to prevent heart attack and stroke in persons with cardiovascular disease and to control unstable angina. The drug's usefulness in preventing certain cancers, the dangerous high blood pressure that sometimes occurs during pregnancy (toxemia), and migraine headaches is also under investigation.

Normal dosage may cause nausea, vomiting, diarrhea, or gastrointestinal bleeding. Large doses cause acid-base imbalance and respiratory disturbances and can be fatal, especially in children. Aspirin also has been linked to the development of Reye's syndrome (a combination of acute encephalopathy and fatty infiltration of internal organs) in children who have taken it for viral infections. Acetaminophenacetaminophen
, an analgesic and fever-reducing medicine. It is an active ingredient in many over-the-counter medicines, including Tylenol and Midol. Introduced in the early 1900s, acetaminophen is a coal tar derivative that acts by interfering with the synthesis of
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 (Tylenol), which does not cause gastric irritation but does lower fever and relieve pain, is often substituted for aspirin.

Aspirin, although usually made synthetically now, was originally derived from salicin, the active ingredient in willow bark. Willow bark had been used for centuries in folk medicine in certain parts of the world. Acetylsalicylic acid was first prepared by the German chemist Felix Hoffmann, an employee of Friedrich Bayer & Co., in 1897. It is now the active ingredient in many over-the-counter preparations; estimates put American consumption at 80 billion tablets annually.

See analgesicanalgesic
, any of a diverse group of drugs used to relieve pain. Analgesic drugs include the nonsteroidal anti-inflammatory drugs (NSAIDs) such as the salicylates, acetaminophen, narcotic drugs such as morphine, and synthetic drugs with morphinelike action such as meperidine
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(organic chemistry)


1. a white crystalline compound widely used in the form of tablets to relieve pain and fever, to reduce inflammation, and to prevent strokes. Formula: CH3COOC6H4COOH
2. a tablet of aspirin


(language, tool)
A freeware language from MITRE Corporation for the description of neural networks. A compiler, bpmake, is included. Aspirin is designed for use with the MIGRAINES interface.

Version: 6.0, as of 1995-03-08.
References in periodicals archive ?
14 1 -- Doryichthys heterosoma -- 1 -- -- Rhyacichthys aspro -- 1 -- -- Ambassis sp.
This is in fact the criterion used to distinguish aspro from dolce.
Aspro, part of Airtours, admitted liability but a compensation package hasonly just been agreed.
Accommodation and flight supplements are extra and payable in full - see Airtours/ Aspro 4th Edition brochures for full details.
Research carried out by St John's Ambulance and Aspro Clear has shown that 45 per cent of all holidaymakers fail to take a first aid kit when travelling abroad.
You can choose a two-week holiday for the price of one in Tenerife, Gran Canaria or Fuerteventura with Airtours or Aspro, take off to Corfu with Kosmar Holidays, or you can choose from seven popular holiday destinations from First Choice.
Aspro Mavro made up in part for the earlier defeat of stablemate Clockmaker when taking the 1m2f maiden.
The company faced significant increases in utility costs while the management fee paid to its parent company, Aspro Group, also rose.
But the Morrows, from North Belfast, who were also there with Joseph's sister Ruth and her husband Victor, were left to look after themselves after their tour operator Aspro failed to offer them help.
HOW TO GET THERE: Two can stay at the Parque Nourabel Apartments in Villa Moura for pounds 359pp including flights between August 16 and 24 through Aspro (02890 322550/ www.
Tour operator Aspro has now admitted responsibility for the incident after the children's parents Jacqui and Gary West launched a fight for compensation.