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While the work of Rochon et al¹ is laudable in intent, it is, unfortunately, misleading in its title and in its conclusions, although clearly stating the authors' caveats about these very conclusions. The authors made the same mistake the Food and Drug Administration made in categorizing the atypical antipsychotic drugs as a single class. In this study, 80% of their patients were initially dispensed risperidone; 18%, olanzapine; and 2%, quetiapine fumarate. While these drugs are all labeled "atypical," there is no consensus definition of what "atypical" means. These drugs have very different movement disorder adverse effects. Data from a study on Parkinson disease (PD) suggest that quetiapine does not worsen motor function, whereas olanzapine and risperidone do.² Because all the dementing illnesses are associated with parkinsonism, the effects of these drugs in PD is relevant.³ A recent placebo-controlled trial, in fact, confirms this.⁴ In the nonelderly, risperidone has been associated . . . [Full Text of this Article]

AUTHOR INFORMATION
Joseph H. Friedman, MD

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