AbbVie, Inc. (ABBV) and Gilgamesh Pharmaceuticals Inc. announced Monday a definitive agreement under which AbbVie will acquire Gilgamesh's lead investigational candidate, Bretisilocin, for up to $1.2 billion, inclusive of an upfront payment and development milestones.
Bretisilocin is currently in clinical development for the treatment of patients with moderate-to-severe major depressive disorder (MDD).
Bretisilocin, a 5-HT2A receptor agonist and 5-HT releaser, is a novel, next-generation psychedelic compound designed to address development challenges observed within this class of compounds. It has been shown to exert a shorter duration of psychoactive experience, while retaining an extended therapeutic benefit.
Additionally, as part of the transaction, Gilgamesh will spin off a new entity that will operate under the name Gilgamesh Pharma Inc. to hold its employees and other programs, including its oral NMDA receptor antagonist blixeprodil (GM-1020), cardio-safe ibogaine analog, M1/M4 agonist program and existing collaboration with AbbVie. The transaction is subject to customary closing conditions.
This transaction builds upon AbbVie and Gilgamesh's 2024 collaboration and option-to-license agreement to advance the development of next-generation therapies for the treatment of psychiatric disorders. This option-to-license remains in effect and will be transferred to Gilgamesh Pharma Inc. in connection with the spin-out.
For comments and feedback contact: editorial@rttnews.com
Business News
April 17, 2026 15:29 ET The ongoing conflict in the Middle East continues to raise concerns for policymakers who worry about the impact of the supply shock and high energy prices on the real economy. Producer price data and various survey results on the housing market were the main news from the U.S. this week. In Europe, industrial production data for the euro area gained attention. GDP figures out of China and the policy move by the Singapore central bank were in focus in Asia.