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Main article: Toxins
File:Hazard T.svg

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

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.


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".

List of poisons with psychological effects

Main article: Toxic disorders


Poisoning is a substantial health problem throuhot the world

File:Poisonings world map - DALY - WHO2004.svg

Disability-adjusted life year for poisonings per 100,000 inhabitants in 2004.[2]

██ no data ██ less than 10 ██ 10-90 ██ 90-170 ██ 170-250 ██ 250-330 ██ 330-410 ██ 410-490 ██ 490-570 ██ 570-650 ██ 650-700 ██ 700-880 ██ more than 880

In the US

  • In 2004, poisonings surpassed firearms accidents to become the second leading cause of unintentional injury deaths and in 2007, unintentional poisonings were the leading cause of unintentional injury death for adults 35-54.
  • From 2006-2007, unintentional poisoning deaths increased 6%, while motor vehicle accidents, the second leading cause of unintentional injury deaths, decreased 4%.
  • In 2009, U.S. poison centers received nearly 2.5 million calls related to human toxin exposure, 1.7 million poison information calls, and over 116,000 non-human exposure calls and a poison center answers a call about a suspected or actual poisoning exposure every 13 seconds.

Children are particularly at risk

  • those under the age of 6 were involved in the majority of poisoning exposures in 2009, but they made up less than 2% of poisoning fatalities.

By Substance

  • Cosmetics and personal care products were the most frequently involved substances in pediatric (5 years old and younger) poisoning exposures in 2009.
  • Prescription and non-prescription pain medicines (analgesics) were the most frequently involved substances in poisoning exposures for callers of all ages in 2009.

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.


  • 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.[3]
    • 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).[4]
    • 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.[5] 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.[6]
    • 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.[7]


Some poisons have specific antidotes:

Poison/Drug Antidote
paracetamol (acetaminophen) N-acetylcysteine
vitamin K anticoagulants, e.g. warfarin vitamin K
opioids naloxone
iron (and other heavy metals) desferrioxamine, Deferasirox or Deferiprone
benzodiazepines flumazenil
ethylene glycol ethanol or fomepizole, and thiamine
methanol ethanol or fomepizole, and folinic acid
cyanide amyl nitrite, sodium nitrite and sodium thiosulfate
Organophosphates Atropine and Pralidoxime
Magnesium Calcium Gluconate
Calcium Channel Blockers (Verapamil, Diltiazem) Calcium Gluconate
Beta-Blockers (Propranolo, Sotalol) Calcium Gluconate and/or Glucagon
Isoniazid Pyridoxine
Atropine Physostigmine
Thallium Prussian blue

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


  1. Template:DorlandsDict
  2. (2009). WHO Disease and injury country estimates. World Health Organization. URL accessed on Nov. 11, 2009.
  3. Chyka PA, Seger D, Krenzelok EP, Vale JA (2005). Position paper: Single-dose activated charcoal. Clin Toxicol (Phila) 43 (2): 61–87.
  4. (2004). Position paper: whole bowel irrigation. J Toxicol Clin Toxicol 42 (6): 843–54.
  5. Vale JA, Kulig K; American Academy of Clinical Toxicology; European Association of Poisons Centres and Clinical Toxicologists. (2004). Position paper: gastric lavage. J Toxicol Clin Toxicol 42 (7): 933–43.
  6. American Academy of Clinical Toxicology; European Association of Poisons Centres Clinical Toxicologists (2004). Position paper: Ipecac syrup. J Toxicol Clin Toxicol 42 (2): 133–43.
  7. Toxicology, American Academy of Clinical (2004). Position paper: cathartics. J Toxicol Clin Toxicol 42 (3): 243–53.

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