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Definium Says LSD-Based Pill Reduces Anxiety in Late-Stage Study

The company said the treatment produced a 5.4-point placebo-adjusted improvement on a standard anxiety scale and was generally well tolerated.

  • Definium Therapeutics announced on Wednesday that its Phase 3 'Voyage' study of the LSD-based experimental pill DT120 met its primary goal, significantly reducing anxiety symptoms in adults with generalized anxiety disorder.
  • Generalized anxiety disorder affects approximately 26 million U.S. adults, yet the last new FDA-approved treatment for the condition occurred nearly two decades ago, creating significant unmet clinical need.
  • The 214-patient trial showed participants receiving the 100-microgram DT120 dose experienced an 11.6-point reduction on the Hamilton Anxiety Rating Scale at week 12, compared to a 6.2-point drop for the placebo group.
  • Following the announcement, shareholders pushed the company's stock up 15% to just over $47 apiece at market open Wednesday, though the share price settled around $43 by mid-morning.
  • Definium expects a second Phase 3 trial called 'Panorama' to produce data in September; Evercore ISI analyst Gavin Clark-Gartner models $2 billion in peak annual sales for DT120 in generalized anxiety disorder.
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El Mundo broke the news in Madrid, Spain on Tuesday, August 11, 2026.
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