AbbVie Completes Acquisition of Gilgamesh Pharmaceuticals' Bretisilocin

Accessibility StatementSkip Navigation Acquisition expands AbbVie's psychiatry pipeline with the addition of a next-generation psychedelic compound currently in Phase 2 development for the treatment of major depressive disorder (MDD). NORTH CHICAGO, Ill., Oct. 17, 2025 /PRNewswire/ -- AbbVie (NYSE: ABBV) announced today that it has completed its acquisition of Gilgamesh Pharmaceuticals' lead investigational candidate, bretisilocin. Bretisilocin is a novel, short-acting serotonin 5-HT2A receptor agonist an ...