In turn, its influence on the reward circuit can lead a user to bypass survival activities and repeat drug use. Chronic cocaine use can lead to a cocaine addiction and in some cases damage the brain and other organs. An addict will continue to use cocaine even when faced with adverse consequences.
vasodilator (vÄÂ´zÅdÄ«Â´lÄtur), n 1. an agent that causes dilation of the blood vessels. n 2. a drug that relaxes the smooth muscle walls of the blood vessels and increases their diameter.
A vasoconstrictor, also called vasopressor, is any substance that causes the layer of smooth muscle in the blood vessels to contract, resulting in a shortening of the diameter of the blood vessel.asoconstriction can cause high blood pressure. The eyes of a healthy person normally dilate only when in dim light. A vasoconstrictor is any substance that causes the layer of smooth muscle in the blood vessels to contract. View slideshow of images above.