Bretisilocin, also known as GM-2505 or 5-fluoro-N-methyl-N-ethyltryptamine, is a serotonergic psychedelic tryptamine analogue under development as a treatment for major depressive disorder. It's a 5-fluorinated derivative of methylethyltryptamine (MET) and an analogue of dimethyltryptamine (DMT). The administration route for Bretisilocin is intravenous infusion.
2022: First Description in Literature
In 2022, Bretisilocin was first described in the scientific literature.
June 2025: Phase 2 Clinical Trials
In June 2025, Bretisilocin is in phase 2 clinical trials for the treatment of major depressive disorder, and a phase 2a trial has been completed, with the efficacy and safety data released.
August 2025: Acquisition by AbbVie
In August 2025, AbbVie acquired Bretisilocin from Gilgamesh Pharmaceuticals for up to $1.2 billion.
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