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Sir: I read with interest 2 letters published in the April 2006 issue, "High-Dose Aripiprazole in Treatment-Resistant Schizophrenia"1 and "Clozapine Augmentation With Aripiprazole for Negative Symptoms."2 The first letter states, "Comparatively little information is available regarding the use of aripiprazole at doses higher than 30 mg/day."1(p675) The authors of the second letter state, "We found no published reports on the use of aripiprazole as an augmentation agent to clozapine."2(p675)‘ ‹