This is a Study to Determine the Effect of Multiple Doses of an Investigational Drug, Taken by Mouth, in People With Narcolepsy-cataplexy. Accepting Both Males and Females Ages of 18 Years to 55 Years. This Study Will be Conducted in the US and Will Require Approximately 13 Weeks Participation.

Phase 1 Completed 18 enrolled Otsuka Pharmaceutical Development & Commercialization, Inc.

RandomizedCrossoverQuadruple-blindTreatment

This is a study to determine the effect of multiple doses of an investigational drug, taken by mouth, in people with Narcolepsy-cataplexy.

Evaluation	Drug	Modality	Dose	Route
Subject	Ulotaront	Small molecule	25 mg	Oral
Subject	Ulotaront	Small molecule	50 mg	Oral