Carriers deliver controllable cancer chemotherapy

Cancer kills more than half a million men, women, and children each year in the U.S, and chemotherapy is only slightly more discriminating than the disease it treats. As a result, many cancer treatments kill cells throughout ...

Crystallizing knowledge with a learning machine

Transforming a new drug from a set of liquid ingredients in a lab to a pill in a box can be an exercise in complex chemistry. To better understand how drug ingredients crystallize, UConn researchers mined a vast collection ...

Amid intense drought, deadly rains lash Afghanistan

Torrential rainstorms have lashed drought-stricken Afghanistan in recent days, bringing widespread flooding that has killed at least five people and washed away homes including in the capital Kabul, officials said Tuesday.

Researchers find a way to synthesize small cyclodextrins

A team of researchers at Kwansei Gakuin University in Japan has found a way to synthesize small cyclodextrins (types of cyclic oligosaccharides) for the first time. In their paper published in the journal Science, the group ...

New method may lead to better in vivo drug delivery

At some point, every person is likely to experience an inflammatory condition. There are many causes of inflammation, and just as many treatments. Some types of inflammation disappear by themselves, while others require medical ...

Underwater forests a treasure trove of new drugs

Defensive compounds produced by microbes are a major source of antibiotics and other important medicines. But with resistant bugs appearing faster than potential allies, researchers are taking their search for drug candidates ...

Banned pesticides in Europe's rivers

Tests of Europe's rivers and canals have revealed more than 100 pesticides—including 24 that are not licensed for use in the EU.

Cathinone color test is now on the market

Every four days, a new illicit synthetic drug enters the world market. These drugs, which are designed to mimic established drugs of abuse, are cheap, often highly toxic, and difficult—if not impossible—to detect using ...

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Drug

A drug, broadly speaking, is any substance that, when absorbed into the body of a living organism, alters normal bodily function. There is no single, precise definition, as there are different meanings in drug control law, government regulations, medicine, and colloquial usage.

In pharmacology, Dictionary.com defines a drug as "a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being." Drugs may be prescribed for a limited duration, or on a regular basis for chronic disorders.

Recreational drugs are chemical substances that affect the central nervous system, such as opioids or hallucinogens. They may be used for perceived beneficial effects on perception, consciousness, personality, and behavior. Some drugs can cause addiction and habituation.

Drugs are usually distinguished from endogenous biochemicals by being introduced from outside the organism.[citation needed] For example, insulin is a hormone that is synthesized in the body; it is called a hormone when it is synthesized by the pancreas inside the body, but if it is introduced into the body from outside, it is called a drug.[citation needed]

Many natural substances such as beers, wines, and some mushrooms, blur the line between food and drugs, as when ingested they affect the functioning of both mind and body.

This text uses material from Wikipedia, licensed under CC BY-SA