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Acadia Pharmaceuticals said Monday that its approved medicine called Nuplazid failed to improve the social and emotional symptoms of schizophrenia in a late-stage clinical trial. 

The negative outcome of the Phase 3 study represents a setback in the company’s efforts to expand the use of Nuplazid into the treatment of schizophrenia. The medicine is currently approved to treat hallucinations and delusions associated with Parkinson’s disease psychosis.

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“We are disappointed the trial did not meet its primary endpoint given the significant unmet need in patients with negative symptoms of schizophrenia,” said Acadia CEO Steve Davis, in a statement. 

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