Some investigations report that the dosage amount and number of antipsychotics in Japan are higher than those in other countries.This problem was discussed as the quality of psychiatric medication by “the conference of the future about psychiatric health, medicine, and welfare”（Japanese Ministry of Health Labor and Welfare; 2009）. The report of this conference said : “In order to accelerate improvement to single dosage and a reduction in quantity,we should grasp the actual condition of polypharmacy and extensive medication of antipsychotics for schizophrenic patients, and we should discuss the methods of information collection and evaluation”.
 However, there is no evidence regarding whether polypharmacy is good or bad, and no one knows the actual condition of Japanese antipsychotic medications.In order to answer this question, we are performing “A clinical study of the effective correction of polypharmacy and medication with antipsychotics”