Because coffee is a universal drink, it is considered safe for many adults. The coffee drink is designed to be taken in moderation because it is a stimulant and it can be addictive, and in a case of excessive intake of coffee drink, it would produce a series of undesired effects in the body. People who drink more than six cups of coffee a day is likely to become victims of what scientists term as caffeinism. The sickness of caffeinism can be caused by the excessive intake of the coffee drink. People who experience the side effects of the coffee drink are more likely to show symptoms of agitation or anxiety.