Ethanol
Skeletal formula of ethanol
Ball-and-stick model of ethanol Space-filling model of ethanol
Clinical data
Pronunciation/ˈɛθənɒl/
Other namesAbsolute alcohol; Alcohol (USPTooltip United States Pharmacopeia); Cologne spirit; Drinking alcohol; Ethanol (JANTooltip Japanese Accepted Name); Ethylic alcohol; EtOH; Ethyl alcohol; Ethyl hydrate; Ethyl hydroxide; Ethylol; Grain alcohol; Hydroxyethane; Methylcarbinol
Dependence
liability		Physical: Very High Psychological: Moderate[1]
Addiction
liability		Moderate (10–15%)[2]
Routes of
administration		Common: Oral
Uncommon: suppository, inhalation, ocular, insufflation, injection[3]
Drug classAnalgesic; Depressants; Sedatives; Anxiolytics; Euphoriants; GABAA receptor positive modulators Neurotoxins;
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability80%+[4][5]
Protein bindingWeakly or not at all[4][5]
MetabolismLiver (90%):[6][7]
• Alcohol dehydrogenase
• MEOS (CYP2E1)
MetabolitesAcetaldehyde; Acetic acid; Acetyl-CoA; Carbon dioxide; Water; Ethyl glucuronide; Ethyl sulfate
Onset of actionPeak concentrations:[6][4]
• Range: 30–90 minutes
• Mean: 45–60 minutes
• Fasting: 30 minutes
Elimination half-lifeConstant-rate elimination at typical concentrations:[8][7][6]
• Range: 10–34 mg/dL/hour
• Mean (men): 15 mg/dL/hour
• Mean (women): 18 mg/dL/hr
At very high concentrations (t1/2): 4.0–4.5 hours[5][4]
Duration of action6–16 hours (amount of time that levels are detectable)[9]
Excretion• Major: metabolism (into carbon dioxide and water)[4]
• Minor: urine, breath, sweat (5–10%)[6][4]
Identifiers
  • ethanol
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
PDB ligand
Chemical and physical data
FormulaC2H6O
Molar mass46.069 g·mol−1
3D model (JSmol)
Density0.7893 g/cm3 (at 20 °C)[10]
Melting point−114.14 ± 0.03 °C (−173.45 ± 0.05 °F) [10]
Boiling point78.24 ± 0.09 °C (172.83 ± 0.16 °F) [10]
Solubility in waterMiscible mg/mL (20 °C)
  • CCO
  • InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
  • Key:LFQSCWFLJHTTHZ-UHFFFAOYSA-N

Alcohol, sometimes referred to by the chemical name ethanol, is a depressant drug that is the active ingredient in fermented drinks such as beer, wine, and distilled spirits (hard liquor).[11] It is one of the oldest and most commonly consumed recreational drugs, causing the characteristic effects of alcohol intoxication ("drunkenness").[12] 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 (CNS) function.

Ethanol is only one of several types of alcohol; other alcohols such as methanol and isopropyl alcohol are significantly more toxic.[11] A mild, brief exposure to isopropyl alcohol (which is only moderately more toxic than ethanol) is unlikely to cause any serious harm, but methanol is lethal even in small quantities, as little as 10–15 milliliters (2–3 teaspoons). However, several analogues that naturally occur as psychoactive alcohols in alcoholic drinks are less toxic than ethanol. Unlike primary alcohols like ethanol, tertiary alcohols cannot be oxidized into aldehyde or carboxylic acid metabolites, which are often toxic. For example, the tertiary alcohol 2M2B is 20 times more potent than ethanol, and has been used recreationally.

Alcohol has a variety of short-term and long-term adverse effects. Short-term adverse effects include generalized impairment of neurocognitive function, dizziness, nausea, vomiting, and hangover-like symptoms. Alcohol is addictive to humans, and can result in alcohol use disorder, dependence and withdrawal. It can have a variety of long-term adverse effects on health, such as liver and brain damage,[13][14][15] and its consumption can cause cancer.[16] The adverse effects of alcohol on health are most important when it is used in excessive quantities or with heavy frequency. However, some of them, such as increased risk of certain cancers, may occur even with light or moderate alcohol consumption.[17][18] In high amounts, alcohol may cause loss of consciousness or, in severe cases, death. In 2021, there were 2,627 deaths in the US due to alcohol poisoning.[19]

Alcohol works in the brain primarily by increasing the effects of γ-Aminobutyric acid (GABA),[20] the major inhibitory neurotransmitter in the brain; by facilitating GABA's actions, alcohol suppresses the activity of the CNS.[20] The substance also directly affects a number of other neurotransmitter systems including those of glutamate, glycine, acetylcholine, and serotonin.[21][22] The pleasurable effects of alcohol ingestion are the result of increased levels of dopamine and endogenous opioids in the reward pathways of the brain.[23][24] Alcohol also has toxic and unpleasant actions in the body, many of which are mediated by its byproduct acetaldehyde.[25]

Alcohol consumption recommendations

The recommended maximum intake (or safe limits) of alcohol varies from no intake, to daily, weekly, or daily/weekly guidelines provided by health agencies of governments. The World Health Organization published a statement in The Lancet Public Health in April 2023 that "there is no safe amount that does not affect health".[26]

Social effects

Table from the 2010 DrugScience study ranking various drugs (legal and illegal) based on statements by drug-harm experts. This study rated alcohol the most harmful drug overall, and the only drug more harmful to others than to users.[27]
Addiction experts in psychiatry, chemistry, pharmacology, forensic science, epidemiology, and the police and legal services engaged in delphic analysis regarding 20 popular recreational substances. Alcohol was ranked 6th in dependence, 11th in physical harm, and 2nd in social harm.[28]

Alcohol causes a plethora of detrimental effects in society.[29] Many emergency room visits involve alcohol use.[29] As many as 15% of employees show problematic alcohol-related behaviors in the workplace, such as drinking before going to work or even drinking on the job.[29] Drunk dialing refers to an intoxicated person making phone calls that they would not likely make if sober. Alcohol availability and consumption rates and alcohol rates are positively associated with nuisance, loitering, panhandling, and disorderly conduct in open spaces.[30]

Alcohol use is stereotypically associated with crime,[30] both violent and non-violent.[29] Some crimes are uniquely tied to alcohol, such as public intoxication or underage drinking, while others are simply more likely to occur together with alcohol consumption. Crime perpetrators are much more likely to be intoxicated than crime victims. Many alcohol laws have been passed to criminalize various alcohol-related activities.[30][31] Underage drinking and drunk driving are the most prevalent alcohol‐specific offenses in the United States[30] and a major problem in many, if not most, countries worldwide.[32][33][34] About one-third of arrests in the United States involve alcohol misuse,[29] and arrests for alcohol-related crimes constitute a high proportion of all arrests made by police in the U.S. and elsewhere.[35] In general, programs aimed at reducing society's consumption of alcohol, including education in schools, are seen as an effective long-term solution. Strategies aiming to reduce alcohol consumption among adult offenders have various estimates of effectiveness.[36] Policing alcohol‐related street disorder and enforcing compliance checks of alcohol‐dispensing businesses has proven successful in reducing public perception of and fear of criminal activities.[30]

In the early 2000s, the monetary cost of alcohol-related crime in the United States alone has been estimated at over $205 billion, twice the economic cost of all other drug-related crimes.[37] In a similar period in the United Kingdom, the cost of crime and its antisocial effects was estimated at £7.3 billion.[36] Another estimate for the UK for yearly cost of alcohol-related crime suggested double that estimate, at between £8 and 13 billion.[38] Risky patterns of drinking are particularly problematic in and around Russia, Mexico and some parts of Africa.[39] Alcohol is more commonly associated with both violent and non-violent crime than are drugs like marijuana.[29]

Violent crime

The World Health Organization has noted that out of social problems created by the harmful use of alcohol, "crime and violence related to alcohol consumption" are likely the most significant issue.[39] In the United States, 15% of robberies, 63% of intimate partner violence incidents, 37% of sexual assaults, 45–46% of physical assaults and 40–45% of homicides (murders) involved use of alcohol.[40][37] A 1983 study for the United States found that 54% of violent crime perpetrators, arrested in that country, had been consuming alcohol before their offenses.[35] In 2002, it was estimated that 1 million violent crimes in the U.S. were related to alcohol use.[29] More than 43% of violent encounters with police involve alcohol.[29] Alcohol is implicated in more than two-thirds of cases of intimate partner violence.[29] Studies also suggest there may be links between alcohol abuse and child abuse.[30] In the United Kingdom, in 2015/2016, 39% of those involved in violent crimes were under alcohol influence.[41] International studies are similar, with an estimate that 63% of violent crimes worldwide involves the use of alcohol.[37]

The relation between alcohol and violence is not yet fully understood, as its impact on different individuals varies. Studies and theories of alcohol abuse suggest, among others, that use of alcohol likely reduces the offender's perception and awareness of consequences of their actions.[42][30][35][43] Heavy drinking is associated with vulnerability to injury, marital discord, and domestic violence.[29] Moderate drinkers are more frequently engaged in intimate violence than are light drinkers and abstainers, however generally it is heavy and/or binge drinkers who are involved in the most chronic and serious forms of aggression. Research found that factors that increase the likelihood of alcohol‐related violence include difficult temperament, hyperactivity, hostile beliefs, history of family violence, poor school performance, delinquent peers, criminogenic beliefs about alcohol's effects, impulsivity, and antisocial personality disorder. The odds, frequency, and severity of physical attacks are all positively correlated with alcohol use. In turn, violence decreases after behavioral marital alcoholism treatment.[30]

Automobile accidents

An Estonian billboard warning against drunk driving

A 2002 study found 41% of people fatally injured in traffic accidents were in alcohol-related crashes.[44] Misuse of alcohol is associated with more than 40% of deaths that occur in automobile accidents every year.[29] The risk of a fatal car accident increases exponentially with the level of alcohol in the driver's blood.[45]

Most countries have passed laws prohibiting driving a motor vehicle while impaired by alcohol. In the U.S., these crimes are generally referred to as Driving under the influence (DUI), although there are many naming variations among jurisdictions, such as driving while intoxicated (DWI).[46] With alcohol consumption, a drunk driver's level of intoxication is typically determined by a measurement of blood alcohol content or BAC; but this can also be expressed as a breath test measurement, often referred to as a BrAC. A BAC or BrAC measurement in excess of the specific threshold level, such as 0.08% in the U.S.,[47] defines the criminal offense with no need to prove impairment.[48] In some jurisdictions, there is an aggravated category of the offense at a higher BAC level, such as 0.12%, 0.15% or 0.25%. In many jurisdictions, police officers can conduct field tests of suspects to look for signs of intoxication.

Criminologist Hung‐En Sung has concluded in 2016 that with regards to reducing drunk driving, law enforcement has not generally proven to be effective. Worldwide, the majority of those driving under the influence do not end up arrested. At least two thirds of alcohol‐involved fatalities involve repeat drinking drivers. Sung, commenting on measures for controlling drunk driving and alcohol‐related accidents, noted that the ones that have proven effective include "lowering legal blood alcohol concentrations, controlling liquor outlets, nighttime driving curfews for minors, educational treatment programs combined with license suspension for offenders, and court monitoring of high‐risk offenders."[30]

Sexual assault

Alcohol abuse increases the risk of individuals either experiencing or perpetrating sexual violence and risky, casual sex.[49] Caffeinated alcoholic drinks are particularly implicated.[50]

Often, a victim becomes incapacitated due to having consumed alcohol, which then facilitates sexual assault or rape, a crime known as drug-facilitated sexual assault.[51][52] Over 50% of reported rapes involve alcohol.[29] Alcohol remains the most commonly used predator drug,[53][54] and is said to be used in the majority of sexual assaults.[42] Many assailants use alcohol because their victims often willingly imbibe it, and can be encouraged to drink enough to lose inhibitions or consciousness. Sex with an unconscious victim is considered rape in most if not all jurisdictions, and some assailants have committed "rapes of convenience" whereby they have assaulted a victim after he or she had become unconscious from drinking too much.[55]

Public drunkenness

Drunkard passed out on a bench

Public drunkenness or intoxication is a common problem in many jurisdictions. Public intoxication laws vary widely by jurisdiction, but include public nuisance laws, open-container laws, and prohibitions on drinking alcohol in public or certain areas. The offenders are often lower class individuals and this crime has a very high recidivism rate, with numerous instances of repeated instances of the arrest, jail, release without treatment cycle. The high number of arrests for public drunkenness often reflects rearrests of the same offenders.[35]

Methanol-laced alcohol

Methanol is not produced in toxic amounts by fermentation of sugars from grain starches. However, outbreaks of methanol poisoning have occurred when methanol is used to lace moonshine (bootleg liquor).[56] This is commonly done to bulk up the original product to gain profit. Because of its similarities in both appearance and odor to ethanol (the alcohol in beverages), it is difficult to differentiate between the two.

Methanol has a high toxicity in humans. If as little as 10 mL of pure methanol is ingested, for example, it can break down into formic acid, which can cause permanent blindness by destruction of the optic nerve, and 30 mL is potentially fatal,[57] although the median lethal dose is typically 100 mL (3.4 fl oz) (i.e. 1–2 mL/kg body weight of pure methanol[58]). Reference dose for methanol is 0.5 mg/kg/day.[59] Toxic effects take hours to start, and effective antidotes can often prevent permanent damage.[57]

Social benefits

Research on the societal benefits of alcohol is rare, but studies suggests there are benefits.[60] Alcohol consumption while socializing increases occurrences of Duchenne smiling, talking, and social bonding, even when participants are unaware of their alcohol consumption or lack thereof.[61] In a study of the UK, regular drinking was correlated with happiness, feeling that life was worthwhile, and satisfaction with life. According to a causal path analysis, alcohol consumption was not the cause, but rather satisfaction with life resulted in greater happiness and an inclination to visit pubs and develop a regular drinking venue. City centre bars were distinguished by their focus on maximizing alcohol sales. Community pubs had less variation in visible group sizes and longer, more focused conversations than those in city centre bars. Drinking regularly at a community pub led to higher trust in others and better networking with the local community, compared to non-drinkers and city centre bar drinkers.[60]

Health effects

Alcohol has a variety of short-term and long-term adverse effects. It also has reinforcement-related adverse effects, including addiction, dependence, and withdrawal. Alcohol use is directly related to considerable morbidity and mortality, for instance due to overdose and alcohol-related health problems.[62] The World Health Organization advises that there is no safe level of alcohol consumption.[63]

Short-term effects

Symptoms of varying BAC levels. Additional symptoms may occur.

The amount of ethanol in the body is typically quantified by blood alcohol content (BAC); weight of ethanol per unit volume of blood. Small doses of ethanol, in general, are stimulant-like[64] and produce euphoria and relaxation; people experiencing these symptoms tend to become talkative and less inhibited, and may exhibit poor judgement. At higher dosages (BAC > 1 gram/liter), ethanol acts as a central nervous system (CNS) depressant,[64] producing at progressively higher dosages, impaired sensory and motor function, slowed cognition, stupefaction, unconsciousness, and possible death. Ethanol is commonly consumed as a recreational substance, especially while socializing, due to its psychoactive effects.

Central nervous system impairment

Alcohol causes generalized CNS depression, is a positive allosteric GABAA modulator and is associated and related with cognitive, memory, motor, and sensory impairment. It slows and impairs cognition and reaction time and the cognitive skills, impairs judgement, interferes with motor function resulting in motor incoordination, loss of balance, confusion, sedation, numbness and slurred speech, impairs memory formation, and causes sensory impairment. At high concentrations, it can induce amnesia, analgesia, spins, stupor, and unconsciousness as result of high levels of ethanol in blood.

At very high concentrations, alcohol can cause anterograde amnesia, markedly decreased heart rate, pulmonary aspiration, positional alcohol nystagmus, respiratory depression, shock, coma and death can result due to profound suppression of CNS function alcohol overdose and can finish in consequent dysautonomia.

Gastrointestinal effects

compare
Diagram of mucosal layer

Alcohol can cause nausea and vomiting in sufficiently high amounts (varying by person).

Alcohol stimulates gastric juice production, even when food is not present, and as a result, its consumption stimulates acidic secretions normally intended to digest protein molecules. Consequently, the excess acidity may harm the inner lining of the stomach. The stomach lining is normally protected by a mucosal layer that prevents the stomach from, essentially, digesting itself. However, in patients who have a peptic ulcer disease (PUD), this mucosal layer is broken down. PUD is commonly associated with the bacteria Helicobacter pylori, which secretes a toxin that weakens the mucosal wall, allowing acid and protein enzymes to penetrate the weakened barrier. Because alcohol stimulates the stomach to secrete acid, a person with PUD should avoid drinking alcohol on an empty stomach. Drinking alcohol causes more acid release, which further damages the already-weakened stomach wall.[65] Complications of this disease could include a burning pain in the abdomen, bloating and in severe cases, the presence of dark black stools indicate internal bleeding.[66] A person who drinks alcohol regularly is strongly advised to reduce their intake to prevent PUD aggravation.[66]

Ingestion of alcohol can initiate systemic pro-inflammatory changes through two intestinal routes: (1) altering intestinal microbiota composition (dysbiosis), which increases lipopolysaccharide (LPS) release, and (2) degrading intestinal mucosal barrier integrity – thus allowing LPS to enter the circulatory system. The major portion of the blood supply to the liver is provided by the portal vein. Therefore, while the liver is continuously fed nutrients from the intestine, it is also exposed to any bacteria and/or bacterial derivatives that breach the intestinal mucosal barrier. Consequently, LPS levels increase in the portal vein, liver and systemic circulation after alcohol intake. Immune cells in the liver respond to LPS with the production of reactive oxygen species, leukotrienes, chemokines and cytokines. These factors promote tissue inflammation and contribute to organ pathology.[67]

Allergic-like reactions

Ethanol-containing beverages can cause alcohol flush reactions, exacerbations of rhinitis and, more seriously and commonly, bronchoconstriction in patients with a history of asthma, and in some cases, urticarial skin eruptions, and systemic dermatitis. Such reactions can occur within 1–60 minutes of ethanol ingestion, and may be caused by:[68]

  • genetic abnormalities in the metabolism of ethanol, which can cause the ethanol metabolite, acetaldehyde, to accumulate in tissues and trigger the release of histamine, or
  • true allergy reactions to allergens occurring naturally in, or contaminating, alcoholic beverages (particularly wine and beer), and
  • other unknown causes.

Overdose

Symptoms of ethanol overdose may include nausea, vomiting, CNS depression, coma, acute respiratory failure, or death. Levels of even less than 0.1% can cause intoxication, with unconsciousness often occurring at 0.3–0.4%.[69] Death from ethanol consumption is possible when blood alcohol levels reach 0.4%. A blood level of 0.5% or more is commonly fatal. The oral median lethal dose (LD50) of ethanol in rats is 5,628 mg/kg. Directly translated to human beings, this would mean that if a person who weighs 70 kg (150 lb) drank a 500 mL (17 US fl oz) glass of pure ethanol, they would theoretically have a 50% risk of dying.

Long-term effects

Prolonged heavy consumption of alcohol can cause significant permanent damage to the brain and other organs, resulting in dysfunction or death.

Brain damage

Alcohol can cause brain damage, Wernicke's encephalopathy and Alcoholic Korsakoff syndrome which frequently occur simultaneously, known as Wernicke–Korsakoff syndrome.[70] Lesions, or brain abnormalities, are typically located in the diencephalon which result in anterograde and retrograde amnesia, or memory loss.[70]

Liver damage

During the metabolism of alcohol via the respective dehydrogenases, nicotinamide adenine dinucleotide (NAD) is converted into reduced NAD. Normally, NAD is used to metabolize fats in the liver, and as such alcohol competes with these fats for the use of NAD. Prolonged exposure to alcohol means that fats accumulate in the liver, leading to the term 'fatty liver'. Continued consumption (such as in alcohol use disorder) then leads to cell death in the hepatocytes as the fat stores reduce the function of the cell to the point of death. These cells are then replaced with scar tissue, leading to the condition called cirrhosis.

Birth defects

Ethanol is classified as a teratogen. According to the U.S. Centers for Disease Control and Prevention (CDC), alcohol consumption by women who are not using birth control increases the risk of fetal alcohol syndrome. The CDC currently recommends complete abstinence from alcoholic beverages for women of child-bearing age who are pregnant, trying to become pregnant, or are sexually active and not using birth control.[71]

Cancer

The International Agency for Research on Cancer lists ethanol in alcoholic beverages as a Group 1 carcinogen in humans and argues that "There is sufficient evidence and research showing the carcinogenicity of acetaldehyde (the major metabolite of ethanol) which is excreted by the liver enzyme when one drinks alcohol."[72] In 2020, alcohol was estimated to cause 750,000 cases of cancer worldwide, particularly esophagus, liver, and breast cancer.[73]

Other effects

Frequent drinking of alcoholic beverages is a major contributing factor in cases of elevated blood levels of triglycerides.[74]

Alcoholism

Early 20th century Dutch poster about the dangers of alcoholism

Alcoholism or its medical diagnosis alcohol use disorder refers to alcohol addiction, alcohol dependence, dipsomania, and/or alcohol abuse. It is a major problem and many health problems as well as death can result from excessive alcohol use.[29][62] Alcohol dependence is linked to a lifespan that is reduced by about 12 years relative to the average person.[29] In 2004, it was estimated that 4% of deaths worldwide were attributable to alcohol use.[62] Deaths from alcohol are split about evenly between acute causes (e.g., overdose, accidents) and chronic conditions.[62] The leading chronic alcohol-related condition associated with death is alcoholic liver disease.[62] Alcohol dependence is also associated with cognitive impairment and organic brain damage.[29] Some researchers have found that even one alcoholic drink a day increases an individual's risk of health problems by 0.4%.[75]

Two or more consecutive alcohol-free days a week have been recommended to improve health and break dependence.[76][77]

Alcohol withdrawal syndrome

Discontinuation of alcohol after extended heavy use and associated tolerance development (resulting in dependence) can result in withdrawal. Alcohol withdrawal can cause confusion, paranoia, anxiety, insomnia, agitation, tremors, fever, nausea, vomiting, autonomic dysfunction, seizures, and hallucinations. In severe cases, death can result. Delirium tremens is a condition that requires people with a long history of heavy drinking to undertake an alcohol detoxification regimen.

Interactions

Alcohol can intensify the sedation caused by other CNS depressants such as barbiturates, benzodiazepines, opioids, nonbenzodiazepines/Z-drugs (such as zolpidem and zopiclone), antipsychotics, sedative antihistamines, and certain antidepressants.[69] It interacts with cocaine in vivo to produce cocaethylene, another psychoactive substance which may be substantially more cardiotoxic than either cocaine or alcohol by themselves.[78] Ethanol enhances the bioavailability of methylphenidate (elevated plasma dexmethylphenidate).[79] In combination with cannabis, ethanol increases plasma tetrahydrocannabinol levels, which suggests that ethanol may increase the absorption of tetrahydrocannabinol.[80]

Disulfiram-like drugs

Disulfiram

Disulfiram inhibits the enzyme acetaldehyde dehydrogenase, which in turn results in buildup of acetaldehyde, a toxic metabolite of ethanol with unpleasant effects. The medication or drug is commonly used to treat alcohol use disorder, and results in immediate hangover-like symptoms upon consumption of alcohol, this effect is widely known as disulfiram effect.

Metronidazole

Metronidazole is an antibacterial agent that kills bacteria by damaging cellular DNA and hence cellular function.[81] Metronidazole is usually given to people who have diarrhea caused by Clostridium difficile bacteria. Patients who are taking metronidazole are sometimes advised to avoid alcohol, even after 1 hour following the last dose. Although older data suggested a possible disulfiram-like effect of metronidazole, newer data has challenged this and suggests it does not actually have this effect.

Alcohol induced dose dumping (AIDD)

This dose dumping effect is an unintended rapid release of large amounts of a given drug, when administered through a modified-release dosage while co-ingesting ethanol.[82] This is considered a pharmaceutical disadvantage due to the high risk of causing drug-induced toxicity by increasing the absorption and serum concentration above the therapeutic window of the drug. The best way to prevent this interaction is by avoiding the co-ingestion of both substances or using specific controlled-release formulations that are resistant to AIDD.

Methanol and ethylene glycol

The rate-limiting steps for the elimination of ethanol are in common with certain other substances. As a result, the blood alcohol concentration can be used to modify the rate of metabolism of methanol and ethylene glycol. Methanol itself is not highly toxic, but its metabolites formaldehyde and formic acid are; therefore, to reduce the rate of production and concentration of these harmful metabolites, ethanol can be ingested.[83] Ethylene glycol poisoning can be treated in the same way.

Pharmacology

Dynamics

The principal mechanism of action for ethanol has proven elusive and remains not fully understood.[20][84] Identifying molecular targets for ethanol has proven unusually difficult, in large part due to its unique biochemical properties.[84] Specifically, ethanol is a very low molecular weight compound and is of exceptionally low potency in its actions, causing effects only at very high (millimolar mM) concentrations.[84][85] For these reasons, unlike with most drugs, it has not yet been possible to employ traditional biochemical techniques to directly assess the binding of ethanol to receptors or ion channels.[84][85] Instead, researchers have had to rely on functional studies to elucidate the actions of ethanol.[84] Moreover, although it has been established that ethanol modulates ion channels to mediate its effects,[22] ion channels are complex proteins, and their interactions and functions are complicated by diverse subunit compositions and regulation by conserved cellular signals (e.g. signaling lipids).[20][84]

Much progress has been made in understanding the pharmacodynamics of ethanol over the last few decades.[21][84] While no binding sites have been identified and established unambiguously for ethanol at present, it appears that it affects ion channels, in particular ligand-gated ion channels, to mediate its effects in the CNS.[20][21][22][84] Ethanol has specifically been found in functional assays to enhance or inhibit the activity of a variety of ion channels, including the GABAA receptor, the ionotropic glutamate AMPA, kainate, and NMDA receptors, the glycine receptor,[86] the nicotinic acetylcholine receptors,[87] the serotonin 5-HT3 receptor, voltage-gated calcium channels, and BK channels, among others.[20][21][22][88][89] However, many of these actions have been found to occur only at very high concentrations that may not be pharmacologically significant at recreational doses of ethanol, and it is unclear how or to what extent each of the individual actions is involved in the effects of ethanol.[84] In any case, ethanol has long shown a similarity in its effects to positive allosteric modulators of the GABAA receptor like benzodiazepines, barbiturates, and various general anesthetics.[20][84] Indeed, ethanol has been found to enhance GABAA receptor-mediated currents in functional assays.[20][84] In accordance, it is theorized and widely believed that the primary mechanism of action is as a GABAA receptor positive allosteric modulator.[20][84] However, the diverse actions of ethanol on other ion channels may be and indeed likely are involved in its effects as well.[21][84]

In 2007, it was discovered that ethanol potentiates extrasynaptic δ subunit-containing GABAA receptors at behaviorally relevant (as low as 3 mM) concentrations.[20][84][90] This is in contrast to previous functional assays of ethanol on γ subunit-containing GABAA receptors, which it enhances only at far higher concentrations (> 100 mM) that are in excess of recreational concentrations (up to 50 mM).[20][84][91] Ro15-4513, a close analogue of the benzodiazepine antagonist flumazenil (Ro15-1788), has been found to bind to the same site as ethanol and to competitively displace it in a saturable manner.[84][90] In addition, Ro15-4513 blocked the enhancement of δ subunit-containing GABAA receptor currents by ethanol in vitro.[84] In accordance, the drug has been found to reverse many of the behavioral effects of low-to-moderate doses of ethanol in rodents, including its effects on anxiety, memory, motor behavior, and self-administration.[84][90] Taken together, these findings suggest a binding site for ethanol on subpopulations of the GABAA receptor with specific subunit compositions via which it interacts with and potentiates the receptor.[20][84][90][92]

A 2019 study showed the accumulation of an unnatural lipid phosphatidylethanol (PEth) competes with PIP2 agonist sites on lipid-gated ion channels.[93] This presents a novel indirect mechanism and suggests that a metabolite, not the ethanol itself, can affect the primary targets of ethanol intoxication. Many of the primary targets of ethanol are known to bind PIP2 including GABAA receptors,[94] but the role of PEth will need to be investigated for each of the primary targets.

Rewarding and reinforcing actions

The reinforcing effects of alcohol consumption are mediated by acetaldehyde generated by catalase and other oxidizing enzymes such as cytochrome P-4502E1 in the brain.[95] Although acetaldehyde has been associated with some of the adverse and toxic effects of ethanol, it appears to play a central role in the activation of the mesolimbic dopamine system.[96]

Ethanol's rewarding and reinforcing (i.e., addictive) properties are mediated through its effects on dopamine neurons in the mesolimbic reward pathway, which connects the ventral tegmental area to the nucleus accumbens (NAcc).[97][98] One of ethanol's primary effects is the allosteric inhibition of NMDA receptors and facilitation of GABAA receptors (e.g., enhanced GABAA receptor-mediated chloride flux through allosteric regulation of the receptor).[99] At high doses, ethanol inhibits most ligand-gated ion channels and voltage-gated ion channels in neurons as well.[99]

With acute alcohol consumption, dopamine is released in the synapses of the mesolimbic pathway, in turn heightening activation of postsynaptic D1 receptors.[97][98] The activation of these receptors triggers postsynaptic internal signaling events through protein kinase A, which ultimately phosphorylate cAMP response element binding protein (CREB), inducing CREB-mediated changes in gene expression.[97][98]

With chronic alcohol intake, consumption of ethanol similarly induces CREB phosphorylation through the D1 receptor pathway, but it also alters NMDA receptor function through phosphorylation mechanisms;[97][98] an adaptive downregulation of the D1 receptor pathway and CREB function occurs as well.[97][98] Chronic consumption is also associated with an effect on CREB phosphorylation and function via postsynaptic NMDA receptor signaling cascades through a MAPK/ERK pathway and CAMK-mediated pathway.[98] These modifications to CREB function in the mesolimbic pathway induce expression (i.e., increase gene expression) of ΔFosB in the NAcc,[98] where ΔFosB is the "master control protein" that, when overexpressed in the NAcc, is necessary and sufficient for the development and maintenance of an addictive state (i.e., its overexpression in the nucleus accumbens produces and then directly modulates compulsive alcohol consumption).[98][100][101][102]

Relationship between concentrations and effects

Blood alcohol levels and effects[103]
mg/dLmM % v/vEffects
50110.05%Euphoria, talkativeness, relaxation, happiness, gladness, pleasure, joyfulness.
100220.1%Central nervous system depression, anxiety suppression, stress suppression, sedation, nausea, possible vomiting, impaired motor and sensory function,impaired memory impaired cognition
>14030>0.14%Decreased blood flow to brain, slurred speech, double or blurry vision.
300650.3%Stupefaction, confusion, numbness, dizziness, loss of consciousness.
400870.4%Ethylic intoxication, drunkenness, inebriation, alcohol poisoning or possible death.
500109>0.55%Unconsciousness, coma and death.

Recreational concentrations of ethanol are typically in the range of 1 to 50 mM.[91][20] Very low concentrations of 1 to 2 mM ethanol produce zero or undetectable effects except in alcohol-naive individuals.[91] Slightly higher levels of 5 to 10 mM, which are associated with light social drinking, produce measurable effects including changes in visual acuity, decreased anxiety, and modest behavioral disinhibition.[91] Further higher levels of 15 to 20 mM result in a degree of sedation and motor incoordination that is contraindicated with the operation of motor vehicles.[91] In jurisdictions in the U.S., maximum blood alcohol levels for legal driving are about 17 to 22 mM.[104][105] In the upper range of recreational ethanol concentrations of 20 to 50 mM, depression of the central nervous system is more marked, with effects including complete drunkenness, profound sedation, amnesia, emesis, hypnosis, and eventually unconsciousness.[91][104] Levels of ethanol above 50 mM are not typically experienced by normal individuals and hence are not usually physiologically relevant; however, such levels – ranging from 50 to 100 mM – may be experienced by alcoholics with high tolerance to ethanol.[91] Concentrations above this range, specifically in the range of 100 to 200 mM, would cause death in all people except alcoholics.[91]

List of known actions in the central nervous system

Ethanol has been reported to possess the following actions in functional assays at varying concentrations:[85]

Some of the actions of ethanol on ligand-gated ion channels, specifically the nicotinic acetylcholine receptors and the glycine receptor, are dose-dependent, with potentiation or inhibition occurring dependent on ethanol concentration.[85] This seems to be because the effects of ethanol on these channels are a summation of positive and negative allosteric modulatory actions.[85]

Kinetics

Absorption

Ethanol can be taken orally, by inhalation, rectally, or by injection (e.g., intravenous),[6][110] though it is typically ingested simply via oral administration.[4] The oral bioavailability of ethanol is around 80% or more.[4][5] In fasting volunteers, blood levels of ethanol increase proportionally with the dose of ethanol administered.[110] Blood alcohol concentrations may be estimated by dividing the amount of ethanol ingested by the body weight of the individual and correcting for water dilution.[6]

Onset

Peak circulating levels of ethanol are usually reached within a range of 30 to 90 minutes of ingestion, with an average of 45 to 60 minutes.[6][4] People who have fasted overnight have been found to reach peak ethanol concentrations more rapidly, at within 30 minutes of ingestion.[6]

The onset varies depends on the type of alcoholic drink:[111]

  • Vodka/tonic: 36 ± 10 minutes
  • Wine: 54 ± 14 minutes
  • Beer: 62 ± 23 minutes

Also, carbonated alcoholic drinks seem to have a shorter onset compare to flat drinks in the same volume. One theory is that carbon dioxide in the bubbles somehow speeds the flow of alcohol into the intestines.[112]

Food in the gastrointestinal system and hence gastric emptying is the most important factor that influences the absorption of orally ingested ethanol.[6][110] The absorption of ethanol is much more rapid on an empty stomach than with a full one.[6] The delay in ethanol absorption caused by food is similar regardless of whether food is consumed just before, at the same time, or just after ingestion of ethanol.[6] The type of food, whether fat, carbohydrates, or protein, also is of little importance.[110] Not only does food slow the absorption of ethanol, but it also reduces the bioavailability of ethanol, resulting in lower circulating concentrations.[6]

Distribution

Upon ingestion, ethanol is rapidly distributed throughout the body.[4] It is distributed most rapidly to tissues with the greatest blood supply.[6] As such, ethanol primarily affects the brain, liver, and kidneys.[4] Other tissues with lower circulation, such as bone, require more time for ethanol to distribute into.[6] Ethanol crosses biological membranes and the blood–brain barrier easily, through a simple process of passive diffusion.[4][110] The volume of distribution of ethanol is around .55 L/kg (0.53 US pt/lb).[4] It is only weakly or not at all plasma protein bound.[4][5]

Metabolism

Approximately 90% of the metabolism of ethanol occurs in the liver.[6][7] This occurs predominantly via the enzyme alcohol dehydrogenase, which transforms ethanol into its metabolite acetaldehyde (ethanal).[6][7] Acetaldehyde is subsequently metabolized by the enzyme aldehyde dehydrogenase into acetate (ethanoate), which in turn is broken down into carbon dioxide and water.[6] Acetate also combines with coenzyme A to form acetyl-CoA, and hence may participate in metabolic pathways.[4] Alcohol dehydrogenase and aldehyde dehydrogenase are present at their highest concentrations in the liver, but are widely expressed throughout the body, and alcohol dehydrogenase may also be present in the stomach and small intestine.[4] Aside from alcohol dehydrogenase, the microsomal ethanol-oxidizing system (MEOS), specifically mediated by the cytochrome P450 enzyme CYP2E1, is the other major route of ethanol metabolism.[6][7] CYP2E1 is inducible by ethanol, so while alcohol dehydrogenase handles acute or low concentrations of ethanol, MEOS is predominant with higher concentrations or with repeated/chronic use.[6][7] A small amount of ethanol undergoes conjugation to form ethyl glucuronide and ethyl sulfate.[4] There may also be another metabolic pathway that metabolizes as much as 25 to 35% of ethanol at typical concentrations.[5]

At even low physiological concentrations, ethanol completely saturates alcohol dehydrogenase.[6] This is because ethanol has high affinity for the enzyme and very high concentrations of ethanol occur when it is used as a recreational substance.[6] For this reason, the metabolism of ethanol follows zero-order kinetics at typical physiological concentrations.[7] That is, ethanol does not have an elimination half-life (i.e., is not metabolized at an exponential rate), and instead, is eliminated from the circulation at a constant rate.[7][8] The mean elimination rates for ethanol are 15 mg/dL per hour for men and 18 mg/dL per hour for women, with a range of 10 to 34 mg/dL per hour.[7][6] At very high concentrations, such as in overdose, it has been found that the rate of elimination of ethanol is increased.[5] In addition, ethanol metabolism follows first-order kinetics at very high concentrations, with an elimination half-life of about 4 or 4.5 hours (which implies a clearance rate of approximately 6 L/hour/70 kg).[5][4] This seems to be because other processes, such as the MEOS/CYP2E1, also become involved in the metabolism of ethanol at higher concentrations.[4] However, the MEOS/CYP2E1 alone does not appear sufficient to fully explain the increase in ethanol metabolism rate.[5]

Some individuals have less effective forms of one or both of the metabolizing enzymes of ethanol, and can experience more marked symptoms from ethanol consumption than others.[113] However, those having acquired alcohol tolerance have a greater quantity of these enzymes, and metabolize ethanol more rapidly.[113]

Elimination

Ethanol is mainly eliminated from the body via metabolism into carbon dioxide and water.[6] Around 5 to 10% of ethanol that is ingested is eliminated unchanged in urine, breath, and sweat.[4] Transdermal alcohol that diffuses through the skin as insensible perspiration or is exuded as sweat (sensible perspiration) can be detected using wearable sensor technology[114] such as SCRAM ankle bracelet[115] or the more discreet ION Wearable.[116] Ethanol or its metabolites may be detectable in urine for up to 96 hours (3–5 days) after ingestion.[4]

Chemistry

Ethanol is also known chemically as alcohol, ethyl alcohol, or drinking alcohol. It is a simple alcohol with a molecular formula of C2H6O and a molecular weight of 46.0684 g/mol. The molecular formula of ethanol may also be written as CH3−CH2−OH or as C2H5−OH. The latter can also be thought of as an ethyl group linked to a hydroxyl (alcohol) group and can be abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with a slight characteristic odor. Aside from its use as a psychoactive and recreational substance, ethanol is also commonly used as an antiseptic and disinfectant, a chemical and medicinal solvent, and a fuel.

Production

Ethanol is produced naturally as a byproduct of the metabolic processes of yeast and hence is present in any yeast habitat, including even endogenously in humans, but it does not cause raised blood alcohol content as seen in the rare medical condition auto-brewery syndrome (ABS). It is manufactured through hydration of ethylene or by brewing via fermentation of sugars with yeast (most commonly Saccharomyces cerevisiae). The sugars are commonly obtained from sources like steeped cereal grains (e.g., barley), grape juice, and sugarcane products (e.g., molasses, sugarcane juice). Ethanol–water mixture which can be further purified via distillation.

Analogues

Ethanol has a variety of analogues, many of which have similar actions and effects. Methanol (methyl alcohol) and isopropyl alcohol (also called rubbing alcohol) are both toxic, and thus unsafe for human consumption.[11] Methanol is the most toxic alcohol; the toxicity of isopropyl alcohol lies between that of ethanol and methanol, and is about twice that of ethanol.[117] In general, higher alcohols are less toxic.[117] n-Butanol is reported to produce similar effects to those of ethanol and relatively low toxicity (one-sixth of that of ethanol in one rat study).[118][119] However, its vapors can produce eye irritation and inhalation can cause pulmonary edema.[117] Acetone (propanone) is a ketone rather than an alcohol, and is reported to produce similar toxic effects; it can be extremely damaging to the cornea.[117]

The tertiary alcohol tert-amyl alcohol (TAA), also known as 2-methylbutan-2-ol (2M2B), has a history of use as a hypnotic and anesthetic, as do other tertiary alcohols such as methylpentynol, ethchlorvynol, and chloralodol. Unlike primary alcohols like ethanol, these tertiary alcohols cannot be oxidized into aldehyde or carboxylic acid metabolites, which are often toxic, and for this reason, these compounds are safer in comparison.[120] Other relatives of ethanol with similar effects include chloral hydrate, paraldehyde, and many volatile and inhalational anesthetics (e.g., chloroform, diethyl ether, and isoflurane).

History

Alcohol was brewed as early as 7,000 to 6,650 BCE in northern China.[121] The earliest evidence of winemaking was dated at 6,000 to 5,800 BCE in Georgia in the South Caucasus.[122] Beer was likely brewed from barley as early as the 13,000 years ago in the Middle East.[123] Pliny the Elder wrote about the golden age of winemaking in Rome, the 2nd century BCE (200–100 BCE), when vineyards were planted.[124]

Society and culture

Ethanol is typically consumed as a recreational substance by mouth in the form of alcoholic beverages such as beer, wine, and spirits. It is commonly used in social settings due to its capacity to enhance sociability.

Drinking alcohol is generally socially acceptable and is legal in most countries, unlike with many other recreational substances. However, there are often restrictions on alcohol sale and use, for instance a minimum age for drinking and laws against public drinking and drinking and driving.[125] Alcohol has considerable societal and cultural significance and has important social roles in much of the world. Drinking establishments, such as bars and nightclubs, revolve primarily around the sale and consumption of alcoholic beverages, and parties, festivals, and social gatherings commonly involve alcohol consumption. Alcohol is related to various societal problems, including drunk driving, accidental injuries, sexual assaults, domestic abuse, and violent crime.[29] Alcohol remains illegal for sale and consumption in a number of countries, mainly in the Middle East. While some religions, including Islam, prohibit alcohol consumption, other religions, such as Christianity and Shinto, utilize alcohol in sacrament and libation.[126][127][128]

Alcohol consumption is fully legal and available in most countries of the world.[129] Home made alcoholic beverages with low alcohol content like wine, and beer is also legal in most countries, but distilling moonshine outside of a registered distillery remains illegal in most of them.

Some majority-Muslim countries, such as Saudi Arabia, Kuwait, Pakistan, Iran and Libya prohibit the production, sale, and consumption of alcoholic beverages because they are forbidden by Islam.[130][131][132] Laws banning alcohol consumption are found in some Indian states as well as some Native American reservations in the U.S.[129]

In addition, there are regulations on alcohol sales and use in many countries throughout the world.[129] For instance, the majority of countries have a minimum legal drinking age to purchase or consume alcoholic beverages, although there are often exceptions such as underage consumption of small amounts of alcohol with parental supervision. Also, some countries have bans on public intoxication.[129] Drinking while driving or intoxicated driving is frequently outlawed and it may be illegal to have an open container of alcohol or liquor bottle in an automobile, bus or aircraft.[129]

Standard drink

A standard drink is a measure of alcohol consumption representing a fixed amount of pure ethanol, used in relation to recommendations about alcohol consumption and its relative risks to health. The size of a standard drink varies from 8g to 20g across countries, but 10g alcohol (12.7 millilitres) is used in the World Health Organization (WHO) Alcohol Use Disorders Identification Test (AUDIT)'s questionnaire form example,[133] and has been adopted by more countries than any other amount.[134]

See also

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Further reading

Pathophysiology of ethanol
Pharmacology of ethanol
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