Although alcohol affects every part of the body, its effects are more pronounced on the brain, especially during acute cases of alcohol poisoning. In small amounts, alcohol has a stimulating effect on neurons. It causes euphoria and makes social interactions easier and less guarded. However, even in small doses, alcohol has an effect on coordination and concentration.
The effects of alcohol are increased when it is consumed in excessive quantities. At high levels of consumption behavior becomes altered, and sometimes people make inappropriate comments or act differently to how they would normally. At extreme levels, acetaldehyde can cause a coma, and the inhibition of the nervous system resulting in death.