Clinical Pharmacology is the study of drugs and the interactions of chemical substances with living beings, with a view to understanding the properties and their actions, including the interactions between drug molecules drug receptors and how these interactions induce an effect. CLINICAL pharmacology has grown out of a need to extend the discipline of basic pharmacology into clinical practice . A similar evolution of a clinical science took place when clinical pathology became established as a discipline separate from basic pathology. Clinical pharmacologists are physicians, pharmacists, and scientists whose focus is developing and understanding new drug therapies. Clinical pharmacologists work in a variety of settings in academia, industry and government. In the laboratory setting they study biomarkers, pharmacokinetics, drug metabolism and genetics.