Alcohol intoxication

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Alcohol intoxication
Other namesDrunkenness, acute alcohol poisoning, ethanol intoxication, acute alcohol intoxication [1] [2]
Michelangelo drunken Noah.jpg
The Drunkenness of Noah by Michelangelo, 1509
Specialty Toxicology, psychiatry
Symptoms Mild: Mild sedation, decreased coordination [3]
Moderate: Slurred speech, trouble walking, vomiting [3]
Severe: Decreased effort to breathe, coma [3]
Complications Seizures, aspiration pneumonia, injuries, low blood sugar [3] [4]
Usual onsetOver minutes to hours [5]
DurationSeveral hours [5]
Causes Ethanol (alcohol) [6]
Risk factors Social environment, impulsivity, alcoholism [5] [7]
Diagnostic method Typically based on history of events and physical examination [6]
Differential diagnosis Hepatic encephalopathy, Wernicke encephalopathy, methanol toxicity, meningitis, traumatic brain injury [6]
Treatment Supportive care [6]
FrequencyVery common (especially in the Western world) [8]
Deathsc. 2,200 per year (U.S.) [9]

Alcohol intoxication, also known as alcohol poisoning, [1] commonly described as drunkenness or inebriation, [10] is the negative behavior and physical effects caused by a recent consumption of alcohol. [6] [11] In addition to the toxicity of ethanol, the main psychoactive component of alcoholic beverages, other physiological symptoms may arise from the activity of acetaldehyde, a metabolite of alcohol. [12] These effects may not arise until hours after ingestion and may contribute to the condition colloquially known as a hangover.


Symptoms of intoxication at lower doses may include mild sedation and poor coordination. [3] At higher doses, there may be slurred speech, trouble walking, and vomiting. [3] Extreme doses may result in a respiratory depression, coma, or death. [3] Complications may include seizures, aspiration pneumonia, injuries including suicide, and low blood sugar. [3] [4] Alcohol intoxication can lead to alcohol-related crime with perpetrators more likely to be intoxicated than victims. [13]

Alcohol intoxication typically begins after two or more alcoholic drinks. [5] Risk factors include a social situation where heavy drinking is common and a person having an impulsive personality. [5] Diagnosis is usually based on the history of events and physical examination. [6] Verification of events by witnesses may be useful. [6] Legally, alcohol intoxication is often defined as a blood alcohol concentration (BAC) of greater than 5.4–17.4 mmol/L (25–80 mg/dL or 0.025–0.080%). [14] [15] This can be measured by blood or breath testing. [5] Alcohol is broken down in the human body at a rate of about 3.3 mmol/L (15 mg/dL) per hour, [6] depending on an individual's metabolic rate (metabolism). [16]

Management of alcohol intoxication involves supportive care. [6] Typically this includes putting the person in the recovery position, keeping the person warm, and making sure breathing is sufficient. [4] Gastric lavage and activated charcoal have not been found to be useful. [6] Repeated assessments may be required to rule out other potential causes of a person's symptoms. [6]

Acute intoxication has been documented throughout history, and alcohol remains one of the world's most widespread recreational drugs. [17] [18] Some religions consider alcohol intoxication to be a sin. [5] [19]


Wine is a Mocker by Jan Steen c. 1663 The wine is a mocker 1663-1664 Jan Steen.jpg
Wine is a Mocker by Jan Steen c. 1663

Alcohol intoxication leads to negative health effects due to the recent drinking of ethanol (alcohol). [6] When severe it may become a medical emergency. Some effects of alcohol intoxication, such as euphoria and lowered social inhibition, are central to alcohol's desirability. [20]


Stage Three of the Five stages of inebriation, ca.1863-1868, by Charles Percy Pickering (Five stages of inebriation, ca.1863-1868) - photographer Charles Percy Pickering (9610229733) (2).jpg
Stage Three of the Five stages of inebriation, ca.1863–1868, by Charles Percy Pickering

Alcohol is metabolized by a normal liver at the rate of about 8 grams of pure ethanol per hour. 8 grams or 10 ml (0.34 US fl oz) is one British standard unit. An "abnormal" liver with conditions such as hepatitis, cirrhosis, gall bladder disease, and cancer is likely to result in a slower rate of metabolism. [21]

Ethanol is metabolised to acetaldehyde by alcohol dehydrogenase (ADH), which is found in many tissues, including the gastric mucosa. Acetaldehyde is metabolised to acetate by acetaldehyde dehydrogenase (ALDH), which is found predominantly in liver mitochondria. Acetate is used by the muscle cells to produce acetyl-CoA using the enzyme acetyl-CoA synthetase, and the acetyl-CoA is then used in the citric acid cycle. [22]

As drinking increases, people become sleepy, or fall into a stupor. After a very high level of consumption[ vague ], the respiratory system becomes depressed and the person will stop breathing. Comatose patients may aspirate their vomit (resulting in vomitus in the lungs, which may cause "drowning" and later pneumonia if survived). CNS depression and impaired motor co-ordination along with poor judgment increases the likelihood of accidental injury occurring. It is estimated that about one-third of alcohol-related deaths are due to accidents and another 14% are from intentional injury. [23]

In addition to respiratory failure and accidents caused by effects on the central nervous system, alcohol causes significant metabolic derangements. Hypoglycaemia occurs due to ethanol's inhibition of gluconeogenesis, especially in children, and may cause lactic acidosis, ketoacidosis, and acute kidney injury. Metabolic acidosis is compounded by respiratory failure. Patients may also present with hypothermia.


In the past, alcohol was believed to be a non-specific pharmacological agent affecting many neurotransmitter systems in the brain. [24] However, molecular pharmacology studies have shown that alcohol has only a few primary targets. In some systems, these effects are facilitatory and in others inhibitory.

Among the neurotransmitter systems with enhanced functions are: GABAA, [25] 5-HT3 receptor agonism [26] (responsible for GABAergic (GABAA receptor PAM), glycinergic, and cholinergic effects), nicotinic acetylcholine receptors. [27]

Among those that are inhibited are: NMDA, [26] dihydropyridine-sensitive L-type Ca2+ channels [28] and G-protein-activated inwardly rectifying K+ channels. [29]

Alcohol is also converted to a lipid metabolite phosphatidylethanol by phospholipase D2 and this metabolite is shown to bind directly to and regulate ion channels. [30] [31] The result of these direct effects is a wave of further indirect effects involving a variety of other neurotransmitter and neuropeptide systems, leading finally to the behavioural or symptomatic effects of alcohol intoxication. [24]

The order in which different types of alcohol are consumed ("Grape or grain but never the twain" and "Beer before wine and you'll feel fine; wine before beer and you'll feel queer") does not have any effect. [32]

GABAA receptors

Ethanol binding to GABAA receptor Ethanol and GABA Receptor.png
Ethanol binding to GABAA receptor

Many of the effects of activating GABAA receptors have the same effects as that of ethanol consumption. Some of these effects include anxiolytic, anticonvulsant, sedative, and hypnotic effects, cognitive impairment, and motor incoordination. [33] This correlation between activating GABAA receptors and the effects of ethanol consumption has led to the study of ethanol and its effects on GABAA receptors. It has been shown that ethanol does in fact exhibit positive allosteric binding properties to GABAA receptors. However, its effects are limited to pentamers containing the δ-subunit rather than the γ-subunit. [34] GABAA receptors containing the δ-subunit have been shown to be located exterior to the synapse and are involved with tonic inhibition rather than its γ-subunit counterpart, which is involved in phasic inhibition. [33] The δ-subunit has been shown to be able to form the allosteric binding site which makes GABAA receptors containing the δ-subunit more sensitive to ethanol concentrations, even to moderate social ethanol consumption levels (30mM). [35] While it has been shown by Santhakumar et al. that GABAA receptors containing the δ-subunit are sensitive to ethanol modulation, depending on subunit combinations receptors could be more or less sensitive to ethanol. [36] It has been shown that GABAA receptors that contain both δ and β3-subunits display increased sensitivity to ethanol. [34] One such receptor that exhibits ethanol insensitivity is α3-β6-δ GABAA. [36] It has also been shown that subunit combination is not the only thing that contributes to ethanol sensitivity. Location of GABAA receptors within the synapse may also contribute to ethanol sensitivity. [33]


Alcohol intoxication is described as a mental and behavioural disorder by the International Classification of Diseases. (ICD-10). [37] Definitive diagnosis relies on a blood test for alcohol, usually performed as part of a toxicology screen. Law enforcement officers in the United States and other countries often use breathalyzer units and field sobriety tests as more convenient and rapid alternatives to blood tests. [38] There are also various models of breathalyzer units that are available for consumer use. Because these may have varying reliability and may produce different results than the tests used for law-enforcement purposes, the results from such devices should be conservatively interpreted.

Many informal intoxication tests exist, which, in general, are unreliable and not recommended as deterrents to excessive intoxication or as indicators of the safety of activities such as motor vehicle driving, heavy equipment operation, machine tool use, etc.

For determining whether someone is intoxicated by alcohol by some means other than a blood-alcohol test, it is necessary to rule out other conditions such as hypoglycemia, stroke, usage of other intoxicants, mental health issues, and so on. It is best if their behavior has been observed while the subject is sober to establish a baseline. Several well-known criteria can be used to establish a probable diagnosis. For a physician in the acute-treatment setting, acute alcohol intoxication can mimic other acute neurological disorders, or is frequently combined with other recreational drugs that complicate diagnosis and treatment.


Acute alcohol poisoning is a medical emergency due to the risk of death from respiratory depression or aspiration of vomit if vomiting occurs while the person is unresponsive. Emergency treatment strives to stabilize and maintain an open airway and sufficient breathing, while waiting for the alcohol to metabolize. This can be done by removal of any vomit or, if the person is unconscious or has impaired gag reflex, intubation of the trachea. [39]

Other measures may include

Additional medication may be indicated for treatment of nausea, tremor, and anxiety.

Clinical findings

Hospital admissions

Alcohol intoxication was found to be prevalent in clinical populations within the United States involving people treated for [8] trauma [42] and in the age group of people aged within their 18th - 24th years (in a study of a group for the years 1999 - 2004). [43] In the United States during the years 2010 - 2012, acute intoxication was found to be the direct cause of an average of 2,221 deaths, in the sample group of those aged within their 15th year or older. [9] The same mortality route is thought to cause indirectly more than 30,000 deaths per year. [5]


A normal liver detoxifies the blood of alcohol over a period of time that depends on the initial level and the patient's overall physical condition. An abnormal liver will take longer but still succeeds, provided the alcohol does not cause liver failure. [44]

People having drunk heavily for several days or weeks may have withdrawal symptoms after the acute intoxication has subsided. [45]

A person consuming a dangerous amount of alcohol persistently can develop memory blackouts and idiosyncratic intoxication or pathological drunkenness symptoms. [46]

Long-term persistent consumption of excessive amounts of alcohol can cause liver damage and have other deleterious health effects.

Society and culture

A 1936 anti-drinking poster by Aart van Dobbenburgh. An intoxicated man drinking beer; advertising Blauwe Week Wellcome L0048989.jpg
A 1936 anti-drinking poster by Aart van Dobbenburgh.

Alcohol intoxication is a risk factor in some cases of catastrophic injury, in particular for unsupervised recreational activity. A study in the province of Ontario based on epidemiological data from 1986, 1989, 1992, and 1995 states that 79.2% of the 2,154 catastrophic injuries recorded for the study were preventable, of which 346 (17%) involved alcohol consumption. [47] The activities most commonly associated with alcohol-related catastrophic injury were snowmobiling (124), fishing (41), diving (40), boating (31) and canoeing (7), swimming (31), riding an all-terrain vehicle (24), and cycling (23). [47] These events are often associated with unsupervised young males, often inexperienced in the activity, and many result in drowning. [47] Alcohol use is also associated with unsafe sex.

A drunk-driving simulator in Montreal. Drunk driving simulator, Montreal by CAA of Quebec.jpg
A drunk-driving simulator in Montreal.

Laws on drunkenness vary. In the United States, it is a criminal offense for a person to be drunk while driving a motorized vehicle, except in Wisconsin, where it is only a fine for the first offense. [48] It is also a criminal offense to fly an aircraft or (in some American states) to assemble or operate an amusement park ride while drunk. [49] Similar laws also exist in the United Kingdom and most other countries.

In some countries, it is also an offense to serve alcohol to an already-intoxicated person, [50] and, often, alcohol can be sold only by persons qualified to serve responsibly through alcohol server training.

The blood alcohol content (BAC) for legal operation of a vehicle is typically measured as a percentage of a unit volume of blood. This percentage ranges from 0.00% in Romania and the United Arab Emirates; to 0.05% in Australia, South Africa, Germany, Scotland and New Zealand (0.00% for underage individuals); to 0.08% in England and Wales, the United States and Canada. [51]

The United States Federal Aviation Administration prohibits crew members from performing their duties within eight hours of consuming an alcoholic beverage, while under the influence of alcohol, or with a BAC greater than 0.04%. [52] [53]

In the United States, the United Kingdom, and Australia, public intoxication is a crime (also known as "being drunk and disorderly" or "being drunk and incapable"). [54]

In some countries, there are special facilities, sometimes known as "drunk tanks", for the temporary detention of persons found to be drunk.

Religious views


Drunkenness of Noah by Giovanni Bellini Drunkenness of Noah belliniFXD.jpg
Drunkenness of Noah by Giovanni Bellini

Some religious groups permit the consumption of alcohol; some permit consumption but prohibit intoxication; others prohibit any amount of alcohol consumption altogether. Many denominations of Christianity, such as Catholicism, Orthodoxy and Lutheranism, use wine as a part of the Eucharist and permit its consumption, but consider it sinful to become intoxicated. [55]

In the Bible, the Book of Proverbs contains several chapters related to the negative effects of drunkenness and warn to stay away from intoxicating beverages. The Book of Leviticus tells the story of Nadab and Abihu, the eldest sons of Aaron, who were killed for serving in the Temple in Jerusalem after drinking wine, presumably while intoxicated. It continues to discuss monasticism, in which drinking wine is prohibited. The story of Samson in the Book of Judges tells of a monk from the Israelite tribe of Dan who is prohibited from cutting his hair and drinking wine. [56] Romans 13:13–14, [57] 1 Corinthians 6:9–11, Galatians 5:19–21 [58] and Ephesians 5:18 [59] are among a number of other Bible passages that speak against intoxication. While Proverbs 31:4 warns against kings and other rulers drinking wine and similar alcoholic beverages, Proverbs 31:6–7 promotes giving such beverages to the perishing and wine to those whose lives are bitter as a coping mechanism against the likes of poverty and other troubles. [60]

Some Protestant Christian denominations prohibit the consumption of alcohol [61] based upon biblical passages that condemn drunkenness, [56] but others allow a moderate rate of consumption. [62]

In the Church of Jesus Christ of Latter-day Saints, alcohol consumption is forbidden, [63] and teetotalism has become a distinguishing feature of its members. Jehovah's Witnesses allow moderate alcohol consumption among its members.


In the Quran, [64] [65] [66] there is a prohibition on the consumption of grape-based alcoholic beverages, and intoxication is considered an abomination in the hadith of Muhammad. The schools of thought of Islamic jurisprudence have interpreted this as a strict prohibition of the consumption of all types of alcohol and declared it to be haram (lit.'forbidden [in Islam ]'), although other uses may be permitted. [67]


In Buddhism, in general, the consumption of intoxicants is discouraged for both monastics and lay followers. Many Buddhists observe a basic code of ethics known as the five precepts, of which the fifth precept is an undertaking to refrain from the consumption of intoxicating substances [68] (except for medical reasons). [69] In the bodhisattva vows of the Brahmajala Sutra , observed by Mahayana Buddhist communities, distribution of intoxicants is likewise discouraged, as well as consumption. [70]


In the Gaudiya Vaishnavism branch of Hinduism, one of the four regulative principles forbids the taking of intoxicants, including alcohol.


Drunken Lot and his daughters, from an illustrated Torah The Phillip Medhurst Picture Torah 104. Lot and his daughters. Genesis cap 19 vv 31-32. Drevet.jpg
Drunken Lot and his daughters, from an illustrated Torah

In Judaism, in accordance with the biblical stance against drinking, [56] wine drinking is not permitted for priests and monks. [71] The biblical command to sanctify the Sabbath and other holidays has been interpreted as having three ceremonial meals with wine or grape juice, known as Kiddush . [72] [73] A number of Jewish marriage ceremonies end with the bride and groom drinking a shared cup of wine after reciting seven blessings; this occurs after a fasting day in some Ashkenazi traditions. It has been customary and in many cases even mandated to drink moderately so as to stay sober, and only after the prayers are over. [74]

During the Seder on Passover, there is an obligation to drink four ceremonial cups of wine while reciting the Haggadah. It has been assumed as the source for the wine-drinking ritual at the communion in some Christian groups. [75] During Purim, there is an obligation to become intoxicated; however, as with many other decrees, this has been avoided in many communities by allowing sleep during the day as a replacement. [76]

During the U.S. Prohibition era in the 1920s, a rabbi from the Reform Judaism movement proposed using grape juice for the ritual instead of wine. Although refuted at first, the practice became widely accepted by orthodox Jews as well. [77]

Other animals

In the movie Animals are Beautiful People , an entire section was dedicated to showing many different animals including monkeys, elephants, hogs, giraffes, and ostriches, eating over-ripe marula tree fruit causing them to sway and lose their footing in a manner similar to human drunkenness. [78] Birds may become intoxicated with fermented berries and some die colliding with hard objects when flying under the influence. [79] [80]

In elephant warfare, practiced by the Greeks during the Maccabean revolt and by Hannibal during the Punic wars, it has been recorded that the elephants would be given wine before the attack, and only then would they charge forward after being agitated by their driver. [81]

It is a regular practice to give small amounts of beer to race horses in Ireland. Ruminant farm animals have natural fermentation occurring in their stomach, and adding alcoholic beverages in small amounts to their drink will generally do them no harm, and will not cause them to become drunk.

Alcoholic beverages are extremely harmful to dogs, [82] and often for reasons of additives such as xylitol, an artificial sweetener in some mixers. Dogs can absorb ethyl alcohol in dangerous amounts through their skin as well as through drinking the liquid or consuming it in foods. Even fermenting bread dough can be dangerous to dogs. [83]

See also

Related Research Articles

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Alcohol (drug) Active ingredient in alcoholic beverages

Alcohol, sometimes referred to by the chemical name ethanol, is a psychoactive drug that is the active ingredient in drinks such as beer, wine, and distilled spirits. It is one of the oldest and most common recreational substances, causing the characteristic effects of alcohol intoxication ("drunkenness"). Among other effects, alcohol produces happiness and euphoria, decreased anxiety, increased sociability, sedation, impairment of cognitive, memory, motor, and sensory function, and generalized depression of central nervous system function. Ethanol is only one of several types of alcohol, but it is the only type of alcohol that is found in alcoholic beverages or commonly used for recreational purposes; other alcohols such as methanol and isopropyl alcohol are significantly more toxic. A mild, brief exposure to isopropanol, being only moderately more toxic than ethanol, is unlikely to cause any serious harm. Methanol, being profoundly more toxic than ethanol, is lethal in quantities as small as 10–15 milliliters.

Subjective response to alcohol (SR) refers to an individual's unique experience of the pharmacological effects of alcohol and is a putative risk factor for the development of alcohol use disorder. Subjective effects include both stimulating experiences typically occurring during the beginning of a drinking episode as breath alcohol content (BAC) rises and sedative effects, which are more prevalent later in a drinking episode as BAC wanes. The combined influence of hedonic and aversive subjective experiences over the course of a drinking session are strong predictors of alcohol consumption and drinking consequences. There is also mounting evidence for consideration of SR as an endophenotype with some studies suggesting that it accounts for a significant proportion of genetic risk for the development of alcohol use disorder.


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