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Vanda Pharmaceuticals Announces Positive Phase III Results for HETLIOZ®(tasimelteon) in Delayed Sleep-Wake Phase Disorder

  • Vanda Pharmaceuticals reported positive topline results from a Phase III study testing HETLIOZ® in adults with Delayed Sleep-Wake Phase Disorder.
  • The study met its primary endpoint, with HETLIOZ® shifting sleep onset 42.5 minutes earlier compared with 5.4 minutes for placebo.
  • In an exploratory analysis, 60% of participants receiving tasimelteon advanced sleep onset by at least 30 minutes, compared with 15% receiving placebo.
  • Vanda plans to discuss the results with the U.S. Food and Drug Administration and seek approval for HETLIOZ® for this use.
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Vanda Pharmaceuticals Announces Positive Phase III Results for HETLIOZ®(tasimelteon) in Delayed Sleep-Wake Phase Disorder

Study met its primary endpoint: timing of sleep onset shifted 37.1 minutes earlier versus placebo (p=0.022)60% of HETLIOZ® treated participants shifted sleep at least 30 minutes earlier, compared to 15% of the placebo arm

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PR Newswire broke the news in Chicago, United States on Tuesday, September 29, 2026.
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