Pharmacology is the branch of medical science that deals with study of drugs and their effects on biological systems. The word “pharmacology” is derived from two Greek words pharmacon (meaning drugs) and logos (meaning the study or science). Thus, pharmacology is the study of actions of drugs on living systems. It encompasses all aspects of drug action on biological system including biochemical, physiological, its mechanism, therapeutic significances, and adverse effects of drugs. Drugs refer to any chemical substance that affects the processes of living system. They include chemical substances of known chemical structure that are used or intended to be used for diagnosis, prevention, cure, or mitigation of the diseases. Drugs do nothing new with the living system but only changes the physiology of the cell.
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