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In his case it is difficult to say cause of behavior problem: Psychosis
or Borderline intelligence. Such cases frequently poses therapeutic poses to physician.
If he is not responding to quitipine then, its current doses can be increased or his antipsychotic
can be changed. Apart from that regular behavior therapy will also help in behavior symptoms after behavior analysis
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal