Alcohol isn’t a stimulant, it’s a depressant. That’s why drinking too much often leads to impaired judgement, slurring of speech, a tendency to violent behaviour and loss of short-term memory. As alcohol also irritates the stomach, heavy drinking can cause sickness and nausea, and sometimes diarrhoea.
Alcohol also has a dehydrating effect, which is the main reason why excessive drinking can lead to a hangover. It can also lead to temporary impotence in men.
Professor Paul Wallace