** Shares of Acadia Pharmaceuticals ACAD.O down 17.4% at
$19.93 premarket
** Late Monday, co said it will stop further clinical trials
of antipsychotic drug pimavanserin after it failed to improve
negative symptoms of schizophrenia in a late-stage study
** The drug previously failed twice to secure regulatory
approval for the expanded use in the treatment of psychosis
related to dementia and Alzheimer's disease in 2021 and 2022,
respectively
** In 2016, pimavanserin, sold under the brand name
Nuplazid, became the first drug approved in the U.S. to treat
hallucinations and delusions associated with psychosis
experienced by some people with Parkinson's disease
** Nuplazid contributed $522.7 million in revenue last year,
making up nearly 72% of the company's total sales
** As of last close, stock down 22.9% YTD
(Reporting by Pratik Jain in Bengaluru)
((Pratik.Jain@thomsonreuters.com;))