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((Other uses))
((Redirect|Poisoned|the giFT software|giFT))
((rewrite|date=January 2022)) 
((More citations needed|date=June 2019))
((Infobox medical condition (new)
| name          = Poisoning
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[[File:Death rate from unintentional poisoning, OWID.svg|thumb|upright=1.6|Death rate from unintentional poisoning in 2017.<ref>((cite web |title=Death rate from unintentional poisoning |url=https://ourworldindata.org/grapher/death-rate-from-poisonings |website=Our World in Data |access-date=5 March 2020))</ref>]]

'''Poisoning''' is the harmful effect that occurs when too much of a [[poison]], or substance that is harmful to the body, has entered the body.<ref>((Cite web|title=Poisoning|url=https://medlineplus.gov/poisoning.html|access-date=2021-10-26|website=medlineplus.gov))</ref>  Poisons can be swallowed, inhaled, injected or absorbed through the skin.  Poisoning is not to be confused with [[envenomation]].

Acute poisoning is exposure to a [[poison]] on one occasion or during a short period of time. Symptoms develop in [[dose–response relationship|close relation to the degree of exposure]]. Absorption of a poison is necessary for systemic poisoning (that is, in the blood throughout the body). In contrast, substances that destroy tissue but do not absorb, such as [[lye]], are classified as [[corrosive substance|corrosive]]s rather than poisons. Furthermore, many common household medications are not labeled with [[skull and crossbones (symbol)|skull and crossbones]], although they can cause severe illness or even death. In the medical sense, [[toxicity]] and poisoning can be caused by less dangerous substances than those legally classified as a poison. [[Toxicology]] is the study and practice of the symptoms, mechanisms, diagnosis, and treatment of poisoning.<ref>((Cite web |title=Toxicology |url=https://www.niehs.nih.gov/health/topics/science/toxicology/index.cfm |access-date=2022-12-05 |website=National Institute of Environmental Health Sciences |language=en))</ref>

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]], or are [[biomagnification|biomagnified]], such as [[mercury (element)|mercury]], gadolinium, 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 [[neurotoxin]]s and so-called [[nerve gas]]es, which may be synthesized for [[chemical warfare|warfare]] or industry.

Inhaled or ingested [[cyanide]], used as a method of [[execution]] in [[gas chamber]]s, almost instantly starves the body of energy by [[enzyme inhibitor|inhibiting]] the [[enzymes]] in [[mitochondria]] that make [[Adenosine triphosphate|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 [[Membrane potential|cell potential]] necessary for [[muscle contraction]].

Most biocides, including [[pesticide]]s, are created to act as poisons to target organisms, although acute or less observable chronic poisoning can also occur in non-target organisms ([[secondary poisoning]]), including the [[human]]s who apply the biocides and other [[beneficial organism]]s. For example, the herbicide [[2,4-D]] imitates the action of a plant hormone, which makes its lethal toxicity 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 [[Medication|drug]] molecules are made toxic in the liver, and the genetic variability of certain liver [[enzyme]]s makes the toxicity of many compounds differ between people.

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

== Treatment ==
If a person is suspected to have been exposed or ingested a poison, medical assistance to determine an appropriate treatment is necessary. If a suspected poisoning has occurred but the person is awake and alert, it is recommended to call the local poison information centre.<ref name=":0">((Cite web|date=2020-07-02|title=Poisoning Prevention ((!)) Child Safety and Injury Prevention((!)) CDC Injury Center|url=https://www.cdc.gov/safechild/poisoning/index.html|access-date=2020-11-28|website=www.cdc.gov|language=en-us))</ref> If the person has collapsed or is having difficulty breathing, emergency medical assistance is required.<ref name=":0" /><ref>((Cite journal|last1=Yadav |first1=Sharad |last2=Shah |first2=Gautam Kumar |last3=Verma |first3=Dharmesh |last4=Yadav |first4=Prakash Chand |date=2022-07-22 |title=Study of profile, pattern and outcomes of oral poisoning cases admitted in emergency department of Janakpur provincial hospital, Nepal |url=https://zenodo.org/record/6879818 |doi=10.5281/zenodo.6879818))</ref> To assist medical personnel, describe the person's symptoms, age, weight, other medications that person is taking, and any information about the poison. Try to determine the amount ingested and how long since the person was exposed to it. If possible, have on hand the pill bottle, medication package or other suspect container.<ref>((Cite web|title=Poisoning: First aid - Mayo Clinic|url=https://www.mayoclinic.org/first-aid/first-aid-poisoning/basics/ART-20056657?p=1|access-date=2021-10-26|website=www.mayoclinic.org))</ref>

The treatment will depend on the substance to which the patient is exposed. Depending on the type of poisoning, some first aid measures may help. Treatments include activated charcoal, induction of vomiting and dilution or neutralizing of the poison.<ref>((Cite journal|last1=Avau|first1=Bert|last2=Borra|first2=Vere|last3=Vanhove|first3=Anne-Catherine|last4=Vandekerckhove|first4=Philippe|last5=De Paepe|first5=Peter|last6=De Buck|first6=Emmy|date=December 2018|title=First aid interventions by laypeople for acute oral poisoning|journal=The Cochrane Database of Systematic Reviews|volume=12|issue=12 |pages=CD013230|doi=10.1002/14651858.CD013230|issn=1469-493X|pmc=6438817|pmid=30565220))</ref>

== Prevention ==

[[File:Arsenic trioxide.jpg|thumb|250px|[[Arsenic trioxide]] is a white, crystalline powder that closely resembles sugar. The [[1858 Bradford sweets poisoning]] incident happened because it was mistaken for a sugar substitute ("daff").]]

Prevention strategies include locking up medicines and cleaners, reading labels on medicines and cleaners before using or storing, and safely discarding unneeded medicines, herbal supplements, and vitamins.<ref name=":0" />

== See also ==

* [[EPA list of extremely hazardous substances]]
* [[Lists of poisonings]]
* [[List of poisonous plants]]
* [[List of types of poison]]
* [[Toxicity]]

==References==
((Reflist))

== External links ==
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((Poisoning and toxicity))
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[[Category:Toxicology]]
[[Category:Poisons]]
[[Category:Killings by type]]

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