serotonin 5-HT2A receptor. Clinical studies have demonstrated that Aripiprazole and its N-oxides are well tolerated and do not significantly induce extra pyramidal syndromes, which are the side effects, found in the case of drugs having a strong activity for blocking neurotransmission of dopaminergic receptor. The N-oxides of Aripiprazole include Aripiprazole-4-N-oxide, Aripiprazole-1-N-oxide and Aripiprazole-1