Intoxication of alcohol is a serious problem which can lead to various types of consequences. We can classify alcohol into three general categories: ethanol, ethylene glycol and methanol. People have different amount of adipose tissues and water in their body which make the distribution and the blood alcohol level different from each other. After ingestion of ethanol, enzymes such as alcohol dehydrogenase and acetaldehyde dehydrogenase metabolize ethanol. Acetaldehyde dehydrogenases plays an important role in alcohol metabolism.