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Fundamentals of Neurobiology

This chapter examines the basic pharmacology of psychotropic drugs. Besides knowing what drugs do to certain chemicals or proteins in the brain, it is important to know where drugs affect those chemicals or proteins. There is some basic knowledge about neuroanatomy that is relevant to the clinical practice of psychopharmacology. It is accepted that neurobiology is an important factor in the etiology and pathophysiology of major psychiatric conditions—like schizophrenia and manic-depressive disease, as well as in other psychiatric clinical pictures. The general summary usually provided is that neurobiology represents a diathesis to psychiatric conditions, which is supplemented by environmental stress to produce observed clinical pictures. This mixture of genetics and environment is oversimplified in the minds of most mental health professionals. In fact, the mix depends on the illness. The biochemical neuroanatomy of the monoamines, glutamate, and GABA in the brain are discussed. Pharmacokinetic aspects of psychopharmacology are reviewed, including hepatic metabolism, drug half-lives, dosing, and tolerance and sensitization.