Pharmacology is the branch of medicine and biology concerned with the study of drug action, where a drug can be broadly defined as any man-made, natural, or endogenous (within the body) molecule which exerts a biochemical and/or physiological effect on the cell, tissue, organ, or organism. This department helps to evaluate the drugs by using animal experimentation which may helps to adjust the doses of drugs in humans as well as to know the toxicities of the drugs.