Definium says LSD-based pill reduces anxiety in late-stage study

Definium Therapeutics DFTX.O said on Wednesday its LSD-based experimental pill significantly reduced anxiety symptoms in a late-stage study, meeting the trial's main goal.

The 214-patient trial tested a single 100-microgram dose of DT120, a fast-dissolving tablet of lysergide, the chemical name for LSD, in adults with generalized anxiety disorder, or GAD.

Patients on the drug had an 11.6-point drop on a standard anxiety rating scale at week 12, compared with a 6.2-point drop for those on a placebo.

The placebo-adjusted difference of 5.4 points was statistically significant and clinically meaningful, the company said.

Ahead of the readout, Jefferies analysts last week had forecast a placebo-adjusted reduction of more than 5 points as a key benchmark for success in the study.

GAD is characterized by persistent and excessive worry that can interfere with daily life. It affects about 26 million U.S. adults and is commonly treated with antidepressants, anti-anxiety medicines and psychotherapy.

No new drug has been approved for the condition in nearly two decades, according to Brian Barnett, a Cleveland Clinic psychiatrist who worked on the study.

Unlike most anxiety medicines, which are typically taken regularly, DT120 is designed to be administered as a single dose during a monitored dosing session. It works by acting on brain receptors involved in mood and perception.

Most side effects were mild to moderate and temporary, occurring mainly on the day of dosing, with no increase in suicidal thoughts.

The trial is Definium's second late-stage success for DT120, following a positive readout in a depression study in June.