June 29 (Reuters) - BioXcel Therapeutics (BTAI.O) flagged issues related to the recording of safety data at one of the sites for late-stage trial of its Alzheimer's drug, sending its shares plunging more than 67% in premarket trading on Thursday. The drug, named BXCL501, was being studied to treat patients with agitation related to Alzheimer's disease. The issue highlighted by the company overshadowed results of the drug's trial, which was also reported on Thursday. BioXcel said it plans to submit an application to expand the use of the drug in the second half of this year. The drug is already approved by the FDA for treating agitation associated with schizophrenia or bipolar I or II disorder in adults.

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Persons: Vimal Mehta, Robyn Karnauskas, BioXcel, Khushi Mandowara, Krishna Chandra Eluri Organizations: BioXcel Therapeutics, U.S . Food, Drug Administration, Truist Securities, Thomson Locations: Bengaluru