This article discusses the pharmaceutical theory of personality and provides answers to the difficult questions of twins and the big four questions. The article also examines the limitations and strengths of the theory, in addition to parallel research conducted by the pharmaceutical industry on professionals prescribing pharmaceuticals. The article examines the effects of pharmaceutical theory in action and raises concerns about the known effectiveness of medications, including the lack of knowledge about when pharmaceutical treatment should cease. Modern psychology, all disciplines combined, would be the study of pharmaceutical theories on personality. With the exception of the pharmaceutical industry and its theories, no personality theory has had more influence on the study than another. Diverse discussions from many different viewpoints have pushed the boundaries and, therefore, science as a whole. In this diversity of thought and research between the world of pharmacy. Considering the many strengths and possible effects of pharmaceuticals on human personalities, despite the various theories used to study them, could be considered to have the most influence on personalities and their study (Manninen, 2006). According to Berecz (2009), the pharmaceutical theory of personality is flawed because of its failure to accommodate the possibility that chemicals are not the solution. This will remain a concern as long as there is no clear map of the physiological causes of depression, etc. With the existence of this loophole, medicine is still prescribed every day as a solution for what are considered ...... middle of paper ...... pediatric patients. Pediatrics, 116, 195-204. doi: 10.1542/peds.2005-0074 Manninen, BA (February 2006). Medicating the mind: a Kantian analysis of the overprescription of psychoactive drugs. Journal of Medical Ethics, 32, 100-105. doi:10.1136/jme.2005.013540McHenry, L. (2006). Ethical issues in psychopharmacology. Journal of Medical Ethics, 32, 405-410. doi:10.1136/jme.2005.013185O'Connell, D.C. & Kowal, S. (2009). The evolution of modern psychology: a critical and prospective perspective on certain pioneers. Journal of Psychology, 217, 73-78. Retrieved from http://web.ebscohost.comReist, D. and VandeCreek, L. (2004). The pharmaceutical industry's use of gifts and educational events to influence prescribing practices: ethical dilemmas and implications for psychologists. Professional Psychology: Research and Practice, 35, 329-335. do I: 10.1037/0735-7028.35.4.329