Abstract

We investigated the relationships between extrapyramidal symptoms (EPS) induced by risperidone, the dosage of risperidone and the combined plasma concentrations of risperidone plus its active metabolite, 9-hydroxyrisperidone, in 20 schizophrenic patients. There was a positive correlation between the scores on the Simpson and Angus Scale and both the dosage of risperidone and the sum of the plasma levels of risperidone and 9-hydroxyrisperidone. These results suggest that EPS induced by risperidone increase in conjunction with both the dosage of risperidone and the total plasma concentrations of the parent compound and its active metabolite.

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