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MindMed was founded in May 2019 by Stephen Hurst and Jamon Rahn.
MindMed initially focused on developing treatments for opioid withdrawal and opioid use disorder with 18-MC, a non-hallucinogenic molecule based on the psychoactive alkaloid ibogaine. In June 2019, it acquired the 18-MC drug development program, previously funded by the National Institute on Drug Abuse, and in September began to prepare 18-MC for a Phase I FDA clinical trial to enable further clinical trials targeting opioid withdrawal and opioid use disorder.
MindMed was the first psychedelic pharmaceutical company to go public, listing on the Canadian NEO Exchange in March of 2020 through a reverse takeover with the Canadian gold mining company Broadway Gold Mining. It began trading on the Nasdaq as MNMD in April 2021 after being approved for an uplisting from the OTC Markets.
In a press release on June 9, 2021 MindMed announced that Jamon Rahn was stepping down both as the CEO and as a director on the board, to be replaced by then CDO Robert Barrow.
On February 26, 2021, MindMed closed its acquisition of digital health startup HealthMode. In connection with the acquisition, Daniel Karlin MD, CEO of HealthMode, was appointed to the position of CMO of the company.
On August 25, 2022, the first patient was dosed in a phase 2b trial for treatment of MM120 (now DT120) in generalized anxiety disorder (GAD). The study would go on to recruit 198 participants. The majority of trial participants experienced statistically significant improvements in their GAD scores, leading to the approval of multiple phase three human trials.
On January 12, 2026, MindMed rebranded to Definium Therapeutics.