Dopamine Effect On The Brain

Biology with an interest neuroscience is my field of study. Which focuses my general research on the effect of neurotransmitters in the brain. Since there is so much information found about the following, the narrowed down idea of this research is the effect of dopamine has on the brain.

To what extent does the neurotransmitter dopamine, have an effect on the brain in the case of a schizophrenic patient?

If a patient with schizophrenia is given a dopamine treatment that blocks the receptors, then it will cause less schizophrenic symptoms within the patient.