Modern psychopharmacology is largely the story of chemical neurotransmission. One must be fluent in the language and principles of chemical neurotransmission to: Understand the actions of drugs on the brain, Grasp the impact of diseases upon the central nervous system, Interpret the behavioral consequences of psychiatric medicines. discuss the following: When a cell is stimulated or polarized, it fires an action potential. Explain the process and how neurotransmitters are dispersed to other neighboring cells across the synapse. Explain the concept of a drug’s half-life.