The discovery of neuroleptics, tranquillizers, and other new psychotropic agents is a major achievement of the 20th century pharmacology [1]. Neuroleptics have found wide use in treating schizophrenia and other mental affections. The up-to-date development of this area resulted in the design and clinical use of new atypical antipsychotic drugs efficient in stopping the adverse symptoms associated with schizophrenia (asocial behavior, reduction of performance and learning capabilities, and so on) and in classical neuroleptics free from adverse side effects related, first of all, to extrapyramidal disorders [2-4]. Unlike classical neuroleptics, atypical antipsychotic agents exert their effects upon interaction with not only the dopamine system but first of all with serotonin and other neuromediator systems [4-6].
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