Psychopharmacology is the study of the use of medications in treating mental disorders. The complexity of this field requires continuous study in order to keep current with new advances. Psychopharmacology is the field of psychology and psychiatry dedicated to the study of drugs' effects on mood and behaviour. Of particular interest in this field is the study of the effectiveness, dosing, and indications for psychoactive drugs. Psychoactive drugs interact with particular target sites or receptors found in the nervous system to induce widespread changes in physiological or psychological functions. The specific interaction between drugs and their receptors is referred to as drug action, and the widespread changes in physiological or psychological function is referred to as drug effect. These drugs may originate from natural sources such as plants and animals, or from artificial sources such as chemical synthesis in the laboratory.

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