Vasoconstrictors are drugs which constrict muscle fibers around blood vessels and narrow the size of the vessel opening. They may act directly on the muscles of blood vessels or stimulate a region in the brain which relays the message to the vessels. Vasoconstrictors are needed to raise blood pressure, increase the force of heart action, and stop local bleeding. Examples of vasoconstrictor drugs are epinephrine (adrenaline), vasopressin, and Aramine (metaraminol).
Drugs That Prevent Blood Clotting. These drugs are called anticoagulants. They are used to prevent the formation of clots in veins and arteries. These clots may cause occlusion (thrombosis) of the blood supply to a vital organ, such as the brain, or may travel from their point of origin to a new site and produce a sudden occlusion of a distant organ (embolism).
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