Alcohol Notes

The chapter covers several key areas related to alcohol consumption:

Forms and Origins: Identify different types of beverage alcohol and their sources.
Pharmacokinetics: Understand how the body processes alcohol and its effects.
Effects of Alcohol: Explore various effects and relate them to pharmacological mechanisms.
Alcohol Use Disorder: Examine the characteristics of alcohol use disorder (AUD) and evaluate treatment options, focusing on pharmacological approaches.

Ethyl Alcohol (Ethanol): This is the sole type of alcohol suitable for human consumption. It is a widely used depressant and the second most common drug worldwide after caffeine.

Alcohol content can be expressed in two ways:
- Alcohol by Volume (ABV): Percentage of alcohol (in grams) per 100 milliliters of the beverage.
- Proof: This is twice the percentage of ABV. For example, a beverage with 40% ABV is 80 proof.

Fermentation: Yeast converts sugars from grains or fruits into alcohol, yielding a maximum of around 15% alcohol. Beers generally have around 5%, while wines can range from 12-15% alcohol.
Distillation: This process separates alcohol from the fermented liquid, resulting in higher alcohol content (20%-95%). Flavor distinctions arise from the initial ingredients and production methods.

One standard drink contains 14 grams of pure alcohol, equivalent to:
- 1.5 ounces of 80 proof liquor (40% alcohol)
- 12 ounces of beer (4.5% alcohol)
- 5 ounces of wine (12% alcohol).

Evidence of alcohol fermentation dates back to 6000 BCE, with recorded history in Sumerian texts from 3200 BCE. Alcohol served both medicinal and recreational purposes.
Pubs first appeared in England during the 12th century, with distilled spirits available starting in the mid-13th century.
Prohibition efforts began in the 19th century, culminating in the 18th Amendment (1920) which prohibited alcohol sales, but proved ineffective until its repeal by the 21st Amendment in 1933.

According to the Canadian Centre on Substance Use and Addiction (CCSA, 2011 and 2023 updates):
- Women: < 10 drinks per week; < 2 drinks in a day.
- Men: < 15 drinks per week; < 2 drinks in a day.
Consuming no alcohol leads to health benefits, while risks increase with greater consumption, notably cancer and other diseases.

In 2002, alcohol-related deaths accounted for approximately 1.9% of overall fatalities in Canada, leading to extensive healthcare costs and high rates of hospitalization.

Absorption: Alcohol is primarily absorbed in the small intestine, with impaired absorption of thiamine leading to conditions like Wernicke-Korsakoff Syndrome.
Distribution: Measured by Blood Alcohol Concentration (BAC), which reflects grams of alcohol per 100 mL of blood. Different BAC levels correlate with various impairing effects, with a legal limit of 0.08 in the U.S.
Metabolism: Predominantly occurring in the liver and stomach, different individuals metabolize alcohol at varying rates due to genetic factors, influencing their susceptibility to alcohol-related diseases.

Alcohol affects several neurotransmitter systems in the CNS, particularly increasing GABAergic function, inhibiting NMDA glutamate receptors, and modulating the endocannabinoid system.

Alcohol Use Disorder: The DSM-V outlines the condition, where two key types are identified:
- Type I: Typically affects adults (25+), linked to psychosocial factors.
- Type II: Involves younger individuals, associated with genetic risk and poorer impulse control.
Withdrawal: Serious abstinence syndrome can arise, requiring medical intervention.
Treatment Options: Include Alcoholics Anonymous (AA), cognitive-behavioral approaches, and pharmacological options such as disulfiram and naltrexone to manage cravings and challenges in alcohol dependence.