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Definition of pharmacology. 1  1 : the science of drugs including their origin, composition, pharmacokinetics, therapeutic use, and toxicology. 2  2 : the properties and reactions of drugs especially with relation to their therapeutic value.
I. OVERVIEW. â¢ Pharmacology is the study of drugs (chemicals) that alter functions of living organisms. â¢ Drug therapy, also called pharmacotherapy, is the. use of drugs to prevent, diagnose, or treat signs, symptoms, and disease processes. â¢ Drugs given for therapeutic purposes are usually. called medications.