Accordingly , this kind of drug interferes with the balance of the hormone dopamine and nor epinephrine in the brain advancing the idea that the said two chemicals are very minimal during the state of depression . It is stated the deficiencies in one or more of the neurotransmitter in the brain such as nor epinephrine , dopamine , and serotonin usually produces depression and may be due to genetic predisposition or external psychosocial factors . This ultimately led to the development of psychotropic drugs...











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