Alcohol
Alcohol is a depressant used in liquid form. Different types include beer, wine, and liquor. Alcohol is absorbed by the stomach and immediately enters into the bloodstream. The first and most common side effect is the loss of inhibitions, allowing the drinker to "relax" and feel "comfortable" in various social situations. When too much alcohol is consumed, the user experiences dizziness, slurred speech, nausea, vomiting, and most dangerously it impairs judgment and coordination. Alcohol is related to many traffic fatalities, as many users do not realize the full extent of their loss of ability to operate a motor vehicle.

Frequent use of alcohol over a long period of time can lead to addiction characterized by extreme cravings. When alcohol use is suddenly stopped, withdrawal symptoms can include anxiety, tremors, hallucinations, and convulsions. Long-term alcohol use can produce severe damage to the brain and liver. When a pregnant mother consumes alcohol, fetal alcohol syndrome can occur. The child may suffer from mental retardation and physical abnormalities.