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Abbvie's Latest Acquisition Targets Gilgamesh's Psychedelic Drug to Treat Depression

AbbVie will pay up to $1.2 billion to acquire bretisilocin, a psychedelic drug showing significant antidepressant effects in Phase 2 trials for major depressive disorder.

  • AbbVie said on Monday it will acquire Gilgamesh Pharmaceuticals' lead antidepressant bretisilocin for up to $1.2 billion, announced from North Chicago, Illinois and New York.
  • Amid nearly 300 million people living with depression, AbbVie's purchase builds on a 2024 collaboration and reflects its focus on expanding psychiatric treatment options.
  • Recent Phase 2a data showed bretisilocin achieved an 18.5-point reduction in MADRS at 24 hours and a-21.6 change at Day 14 versus-12.1 for a low-dose comparator.
  • AbbVie plans to advance bretisilocin toward late-stage clinical development while Gilgamesh will spin off Gilgamesh Pharma Inc. to retain staff and other programs, positioning AbbVie at the forefront of psychiatric care.
  • The deal underscores growing Big Pharma interest in psychedelics, as firms invest billions in next-generation psychedelic therapies despite last year's Cerevel Therapeutics trial failure.
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AbbVie to buy Gilgamesh drug candidate in $1.2B deal

·Washington, United States
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STAT broke the news in Boston, United States on Monday, August 25, 2025.
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