Antipsychotics differ in side effects, however; these differences are the very reason why there should be a hierarchal model of some sort that can classify antipsychotic medication according to which is the most efficient. Antipsychotic medication has been separated into two categories. They are first generation antipsychotics (FGA) and second generation antipsychotics (SGA). First generation antipsychotics include the following: Chlorpromazine (Thoarzine), fluphenazine (Prolixin), haloperidol (Haldol), loxapine (Loxapine), perphenazine (Trilafon), and Thiothixene (Navane). Second generation antipsychotics include the following: Zeprasidone, Risperidone, Olanzapine, Clozapine, Aripiprazole, and Iloperidone. Classification of various antipsychotic medications into first and second generation subgroups is not adequate enough to help Schizophrenic patients with comorbid alcohol or substance abuse. Comparatively, studies have shown results that show mixed results but more studies favor second generation antipsychotics over first generation…