Pharmacology: The Science of Drugs and How They Affect Our Bodies Pharmacology is a branch of science that deals with the study of drugs and their effects on the human body. It combines principles from various fields such as chemistry, biochemistry, physiology, and medicine to understand and manipulate the effects of drugs on living organisms. The History of Pharmacology The origins of pharmacology can be traced back to ancient times, with the use of plant-based remedies for various ailments.