Cardiovascular Pharmacology deals with the study of the effects of drugs upon the heart or circulatory system. Drugs can also affect blood vessels by altering the state of compression of the smooth muscle in the vessel wall, altering its diameter and accordingly directing the volume of blood stream. Cardiovascular pharmacology deals with the treatment of heart disease. Cardiac medications are used to treat the cardiac, circulatory and vascular system. Various cardiovascular agents are available to treat various cardiovascular conditions.