Psychologists should not be allowed to prescribe mental health medications because they do not have the necessary skills and expertise to do so. Psychologists are trained in the general mechanisms that account for human behavior and subjective experience. However, they are not necessarily trained in biochemistry, neuroscience or pharmacology. Psychiatrists and neurologists are trained in these sciences and thus understand the ways in which chemical interactions can change the structure and function of the brain. These specialists also have a wide knowledge base of human anatomy, human physiology and medical science. This knowledge and skill set is necessary in order to safely and effectively prescribe psychiatric mediation.