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  Telegraph - Found 3 hours ago With Your Face Tomorrow: Poison, Shadow and Farewell, Javier Marias has completed one of the great works of European fiction, says Antony Beevor By

• The Bravery, 'Slow Poison' -- Video Premiere

  Spinner.com - Found Nov. 6, 2009 It's no surprise that the video for their new single, 'Slow Poison,' is just a bit trippy.

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  Health n Fitness - Found Nov. 4, 2009 ... especially when it comes [...] Related posts: What If The Weight Loss Product You?re Buying Is Poison? These days, obese people suffer...

• UPDATE 1-Vivendi still eyeing GVT after poison pill move

  Reuters UK - Found Nov. 4, 2009 * Vivendi still monitoring GVT situation- source * Vivendi confident GE will be flexible on NBCU - report * Shares up slightly, underperform French Vivendi still monitoring GVT situation - source - Reuters UPDATE 1-Vivendi still eyeing GVT after poison pill move - Reuters Vivendi still monitoring GVT situation - source - Reuters UK UPDATE 1-Vivendi still eyeing GVT after poison pill move - Reuters India Explore All

• UPDATE 2-GVT removes poison pill, paving way for takeover

  Reuters UK - Found Nov. 3, 2009 * GVT shareholders unanimously remove poison pill * Waiver of clause was precondition for takeover * Shareholders set minimum bid at 48 reais per Brazil GVT shareholders remove poison pill clause - Reuters UPDATE 2-GVT removes poison pill, paving way for takeover - Reuters UPDATE 1-GVT removes poison pill, paving way for takeover - Reuters GVT removes poison pill, paving way for takeover - Forbes.com Explore All

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  Japan Today - Found Oct. 31, 2009 ... report admitting that Chinese-made frozen dumplings that made people ill in Japan were laced with poison in China, diplomatic sources said... Sources: Japan seeking dumpling admission - UPI Explore All

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• Ex-Blagojevich adviser overdosed on rat poison and painkillers, ...

  Chicago Tribune - Found Oct. 29, 2009 Rod Blagojevich, ingested pain-relief medication and rat poison in an apparent suicide in the suburb last month.

• American Association of Poison Control Centers: Count U.S. Poison ...

  Houston Chronicle - Found Oct. 28, 2009 ALEXANDRIA, Va., Oct. 28 /PRNewswire-USNewswire/ -- The same reassuring voice on the telephone line when you fear you've had a poison emergency may American Association of Poison Control Centers: Count U.S. Poison ... - Red Orbit American Association of Poison Control Centers: Count U.S. Poison ... - Freshnews.com American Association of Poison Control Centers: Count U.S. Poison ... - San Antonio Business Journal Explore All

EU standard toxic symbol, as defined by Directive 67/548/EEC. skull and crossbones became a standard symbol for poison.

Treatment for

Toxicology and Poison

General Toxicology (Forensic) Toxinology History of poison

Concepts Poison Venom Toxicant (Toxin) Acceptable daily intake Acute toxicity Bioaccumulation Biomagnification Fixed Dose Procedure LD50 Lethal dose Toxic capacity Toxicity Class

Treatments Antidote Gastric lavage Whole bowel irrigation Activated carbon Cathartic Hemodialysis Chelation therapy Hemoperfusion

Incidents Bradford Minamata Niigata Alexander Litvinenko Bhopal 2007 pet food recalls Seveso disaster List of poisonings

Related topics Hazard symbol Carcinogen Mutagen List of Extremely Hazardous Substances Biological warfare Food safety

Biology portal

v â€¢ d â€¢ e

In the context of biology, poisons are substances that can cause disturbances to organisms,¹ usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism. Legally and in hazardous chemical labelling, poisons are especially toxic substances; less toxic substances are labelled "harmful", "irritant", or not labelled at all.

In medicine (particularly veterinary) and in zoology, a poison is often distinguished from a toxin and a venom. Toxins are poisons produced via some biological function in nature, and venoms are usually defined as biological toxins that are injected by a bite or sting to cause their effect, while other poisons are generally defined as substances which are absorbed through epithelial linings such as the skin or gut.

Terminology

Some poisons are also toxins, usually referring to naturally produced substances, such as the bacterial proteins that cause tetanus and botulism. A distinction between the two terms is not always observed, even among scientists.

Animal toxins that are delivered subcutaneously (e.g. by sting or bite) are also called venom. In normal usage, a poisonous organism is one that is harmful to consume, but a venomous organism uses poison to defend itself while still alive. A single organism can be both venomous and poisonous.

The derivative forms "toxic" and "poisonous" are synonymous.

Within chemistry and physics, a poison is a substance that obstructs or inhibits a reaction, for example by binding to a catalyst. For an example, see nuclear poison.

Paracelsus, the father of toxicology, once wrote: "Everything is poison, there is poison in everything. Only the dose makes a thing not a poison." The phrase "poison" is often used colloquially to describe any harmful substance, particularly corrosive substances, carcinogens, mutagens, teratogens and harmful pollutants, and to exaggerate the dangers of chemicals. The legal definition of "poison" is stricter. A medical condition of poisoning can also be caused by substances that are not legally required to carry the label "poison".

Uses of poison

"Poisoning of Queen Bona" by Jan Matejko.

Throughout human history, intentional application of poison has been used as a method of assassination, murder, suicide, and execution.²³ As a method of execution, poison has been ingested, as the ancient Athenians did (see Socrates), inhaled, as with carbon monoxide or hydrogen cyanide (see gas chamber), or injected (see lethal injection). Many languages describe lethal injection with their corresponding words for "poison shot". Poison's lethal effect can be combined with its allegedly magical powers; an example is the Chinese gu poison. Poison was also employed in gunpowder warfare. For example, the 14th century Chinese text of the Huo Long Jing written by Jiao Yu outlined the use of a poisonous gunpowder mixture to fill cast iron grenade bombs.⁴

On the whole, however, poisons are usually not used for their toxicity, but may be used for their other properties. The property of toxicity itself has limited non-lethal applications: mainly for controlling pests and weeds, cleaning and maintenance, and for preserving building materials and food stuffs. Where possible, specific agents which are less poisonous to humans have come to be preferred, but exceptions such as phosphine continue in use.

Most poisonous materials still in use are used for their chemical or physical properties other than being poisonous. Many over-the-counter medications, such as aspirin and Tylenol, are quite toxic if ingested in sufficiently large quantities. Alcohol is also toxic if too much is ingested in a short enough time. In laboratory environments, where specific chemical properties are often required, the most effective, easiest, safest, or cheapest option for use in a chemical synthesis may be a poisonous material. If a toxic substance possesses these properties more exactly than a non-toxic one, the toxic substance is superior. Chromic acid is an example of such a "simple to use" reagent, but reactivity, in particular, is important. Hydrogen fluoride (HF), for example, is both poisonous and extremely corrosive. However, it has a high affinity (free energy) for silicon, which is exploited by using HF to etch glass or to manufacture silicon semiconductor chips.

On the other hand, certain medical treatments actually make deliberate use of the toxicity of certain substances. Antibiotics (originally harvested from organisms but now artificially produced in laboratories) are highly disruptive to the biochemistry of micro-organisms while having almost no direct effect upon humans. Similarly, the drugs used in chemotherapy are quite toxic; the reason chemotheraputic drugs have far more severe side effects than antibiotics is that their toxicity is not as narrowly tailored. Their benefit arises from the fact that they are—hopefully—more toxic to cancerous cells than normal ones. Such substances could be classified as poisons under the categories defined above, as they are generally artificial in nature, but are not generally discussed as such.

Biological poisoning

Acute poisoning is exposure to a poison on one occasion or during a short period of time. Symptoms develop in close relation to the exposure. Absorption of a poison is necessary for systemic poisoning. In contrast, substances that destroy tissue but do not absorb, such as lye, are classified as corrosives rather than poisons.

Chronic poisoning is long-term repeated or continuous exposure to a poison where symptoms do not occur immediately or after each exposure. The patient gradually becomes ill, or becomes ill after a long latent period. Chronic poisoning most commonly occurs following exposure to poisons that bioaccumulate such as mercury and lead.

Contact or absorption of poisons can cause rapid death or impairment. Agents that act on the nervous system can paralyze in seconds or less, and include both biologically derived neurotoxins and so-called nerve gases, which may be synthesized for warfare or industry.

Inhaled or ingested cyanide, used as a method of execution in gas chambers, almost instantly starves the body of energy by inhibiting the enzymes in mitochondria that make ATP. Intravenous injection of an unnaturally high concentration of potassium chloride, such as in the execution of prisoners in parts of the United States, quickly stops the heart by eliminating the cell potential necessary for muscle contraction.

Most biocides, including pesticides, are created to act as poisons to target organisms, although acute or less observable chronic poisoning can also occur in non-target organism, including the humans who apply the biocides and other beneficial organisms. For example, the herbicide 2,4-D imitates the action of a plant hormone, to the effect that the lethal toxicity is specific to plants. Indeed, 2,4-D is not a poison, but classified as "harmful" (EU).

Many substances regarded as poisons are toxic only indirectly, by toxication. An example is "wood alcohol" or methanol, which is not poisonous itself, but is chemically converted to toxic formaldehyde and formic acid in the liver. Many drug molecules are made toxic in the liver, and the genetic variability of certain liver enzymes makes the toxicity of many compounds differ between individuals.

The study of the symptoms, mechanisms, treatment and diagnosis of biological poisoning is known as toxicology.

Exposure to radioactive substances can produce radiation poisoning, an unrelated phenomenon.

Poisoning management

• Poison Control Centers (reachable at 1-800-222-1222 in the US worldwide) provide immediate, free, and expert treatment advice and assistance over the telephone in case of suspected exposure to poisons or toxic substances.

Initial management

• Initial management for all poisonings includes ensuring adequate cardiopulmonary function and providing treatment for any symptoms such as seizures, shock, and pain.

Decontamination

• If the toxin was recently ingested, absorption of the substance may be able to be decreased through gastric decontamination. This may be achieved using activated charcoal, gastric lavage, whole bowel irrigation, or nasogastric aspiration. Routine use of emetics (syrup of Ipecac), cathartics or laxatives are no longer recommended.
  • Activated charcoal is the treatment of choice to prevent absorption of the poison. It is usually administered when the patient is in the emergency room or by a trained emergency healthcare provider such as a Paramedic or EMT. However, charcoal is ineffective against metals such as sodium, potassium, and lithium, and alcohols and glycols; it is also not recommended for ingestion of corrosive chemicals such as acids and alkalis.⁵
  • Whole bowel irrigation cleanses the bowel, this is achieved by giving the patient large amounts of a polyethylene glycol solution. The osmotically balanced polyethylene glycol solution is not absorbed into the body, having the effect of flushing out the entire gastrointestinal tract. Its major uses are following ingestion of sustained release drugs, toxins that are not absorbed by activated charcoal (i.e. lithium, iron), and for the removal of ingested packets of drugs (body packing/smuggling).⁶
  • Gastric lavage, commonly known as a stomach pump, is the insertion of a tube into the stomach, followed by administration of water or saline down the tube. The liquid is then removed along with the contents of the stomach. Lavage has been used for many years as a common treatment for poisoned patients. However, a recent review of the procedure in poisonings suggests no benefit.⁷ It is still sometimes used if it can be performed within 1 h of ingestion and the exposure is potentially life threatening.
  • Nasogastric aspiration involves the placement of a tube via the nose down into the stomach, the stomach contents are then removed via suction. This procedure is mainly used for liquid ingestions where activated charcoal is ineffective, e.g. ethylene glycol poisoning.
  • Emesis (i.e. induced by ipecac) is no longer recommended in poisoning situations.⁸
  • Cathartics were postulated to decrease absorption by increasing the expulsion of the poison from the gastrointestinal tract. There are two types of cathartics used in poisoned patients; saline cathartics (sodium sulfate, magnesium citrate, magnesium sulfate) and saccharide cathartics (sorbitol). They do not appear to improve patient outcome and are no longer recommended.⁹

Antidotes

Some poisons have specific antidotes:

Enhanced excretion

• In some situations elimination of the poison can be enhanced using diuresis, hemodialysis, hemoperfusion, hyperbaric medicine, peritoneal dialysis, or exchange transfusion.

Further treatment

• In the majority of poisonings the mainstay of management is providing supportive care for the patient, i.e. treating the symptoms rather than the poison.

See also

• Agency for Toxic Substances and Disease Registry (ATSDR)
• Antidote
• Biosecurity
• Food taster
• LD₅₀
• Lethal injection
• List of extremely hazardous substances
• List of fictional toxins
• List of poisonings
• List of poisonous plants
• List of types of poison
• Toxics use reduction
• Venom
• Mr. Yuk

References

External links

• Agency for Toxic Substances and Disease Registry
• American Association of Poison Control Centers
• American College of Medical Toxicology
• ASPCA Animal Poison Control Center
• Clinical Toxicology Teaching Wiki
• Find Your Local Poison Control Centre Here (Worldwide)
• Poison Prevention and Education Website