** Shares of Acadia Pharmaceuticals fall 5.4% to $15.42

** California-based biopharmaceutical company appoints Catherine Owen Adams as new CEO

** Previously, Adams was senior vice president and general manager, U.S., at Bristol Myers Squibb

** Adams succeeds Steve Davis, company's CEO since Sept. 2015

** Thirteen of 19 brokerages rate stock "buy" or higher, 5 rate "hold" and one "sell"; their median PT is $26.5

** Including session's losses, stock down more than 50% YTD

(Reporting by Sukriti Gupta)

((Sukriti.Gupta@thomsonreuters.com;))