British journal of pharmacology
June 1, 2024
Isabel Werle, Laura M M Nascimento, Aymee L A Dos Santos et al.
21 citations
A single oral dose of ayahuasca containing 0.3 mg/kg of DMT increased within-session extinction of contextual freezing behavior in rats without affecting recall; two consecutive daily doses enhanced extinction recall. These effects occurred for both 1- and 21-day-old memories in males and females, independent of changes in anxiety or general exploratory activity. Blocking 5-HT2A receptors in the infralimbic cortex prevented within-session extinction, while blocking 5-HT1A receptors prevented between-session extinction. The findings highlight complementary mechanisms by which ayahuasca facilitates behavioral suppression of aversive memories, suggesting potential benefits for stress-related disorders.
Journal of psychoactive drugs
March 20, 2026
Marina A M Portes, Leandro J Bertoglio
Endurance athletes face unique psychological and physical stressors, yet their knowledge and attitudes toward psychedelic therapies are largely unknown. A survey of 28 Brazilian endurance athletes (mean age 37) found that 64% reported a lack of mental health support in their athletic environments. Only 11% had prior psychedelic experience, while 79% were open to legal, supervised psychedelic therapies. However, 61% were unaware of evidence for psychedelics in treating mental health conditions, and 78% mistakenly believed psychedelics are addictive. Women more often reported pharmacological treatment for depression or anxiety. The findings highlight unmet mental health needs, knowledge gaps, and misconceptions, pointing to a need for targeted, evidence-based education.
European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology
February 1, 2026
Isabel Werle, Francisco S Guimarães, Rafael G Dos Santos et al.
Ayahuasca, a brew containing the psychedelic DMT, helps rodents overcome persistent and generalized fear memories by boosting brain-derived neurotrophic factor (BDNF) signaling in the infralimbic (IL) region of the medial prefrontal cortex. In rats exposed to stress or high-intensity fear conditioning, repeated ayahuasca (0.3 mg/kg DMT) enhanced extinction learning and its retention, and reduced fear generalization. These effects were blocked by infusing an anti-BDNF antibody or a TrkB receptor antagonist into the IL cortex. The reduction in fear generalization depended on BDNF in females but not males. The findings suggest psychedelics may aid in treating difficult-to-extinguish trauma memories, such as those in PTSD.