Pharmacology is the science that studies the effects of drugs, their effect mechanisms and their use in therapy. It deals with the detection and development of the most suitable chemical substance for the treatment of diseases, diagnosis, prophylaxis and other medical purposes by conducting in vivo studies on cell, cellulite, bioactive molecules, tissues and organs in vitro or experimental animal and / or human. It is a science of medicine and pharmacy that contributes to drug development studies by examining the effects of newly synthesized or plant-derived substances  clinical studies  on human beings through laboratory studies and biological studies.