5-HT1A receptor blockade potentiates the subjective effects of DMT.
Journal of psychopharmacology (Oxford, England) May 2, 2026 Zarmeen Zahid, Rick J Strassman, Clifford R Qualls et al.
Blocking the 5-HT1A receptor with pindolol before giving a low dose of DMT to experienced hallucinogen users intensified the drug's subjective effects, with a moderate effect size. Blood pressure also increased shortly after DMT administration, while heart rate was unchanged. The findings suggest that 5-HT1A receptor activity normally dampens the subjective effects of psychedelics, pointing to a functional role for this receptor in shaping the psychedelic experience.