5-HT2B receptor
A serotonin receptor subtype expressed in cardiovascular tissue, the gastrointestinal system, and the trigeminal system. Distinct from the 5-HT2A receptor that mediates psilocybin's psychedelic and antidepressant effects. 5-HT2B and 5-HT2C agonism may mediate psilocybin's preventive effects on cluster headaches and migraines at sub-psychedelic doses — explaining why therapeutic headache benefits occur independently of the intensity of the psychedelic experience. Chronic 5-HT2B agonism at high doses raises theoretical cardiovascular concerns, though this is not a documented issue at therapeutic psilocybin doses.
Full Explanation
The 5-HT2B receptor is a serotonin receptor subtype expressed in cardiovascular tissue, the gastrointestinal system, and the trigeminal system. Distinct from the 5-HT2A receptor that mediates psilocybin's psychedelic and antidepressant effects. 5-HT2B and 5-HT2C agonism may mediate psilocybin's preventive effects on cluster headaches and migraines at sub-psychedelic doses — explaining why therapeutic headache benefits occur independently of the intensity of the psychedelic experience. Chronic 5-HT2B agonism at high doses raises theoretical cardiovascular concerns, though this is not a documented issue at therapeutic psilocybin doses.
See: Cluster Headaches (/conditions/cluster-headaches).
Why It Matters
Understanding 5-HT2B helps explain why psilocybin can relieve cluster headaches at sub-psychedelic doses and why headache benefits do not depend on having a strong psychedelic experience.
Related Terms
Explore More Terms
Psilocybin
A naturally occurring psychedelic compound found in certain mushrooms that produces altered states of consciousness.
Psilocin
The pharmacologically active compound that psilocybin converts to in the body, responsible for psychedelic effects.
Ego Death
A temporary dissolution of the sense of self during a psychedelic experience, often described as profound and transformative.
Set and Setting
The combination of mindset (set) and environment (setting) that shapes a psychedelic experience.
Microdosing
Taking sub-perceptual doses of psilocybin on a regular schedule for subtle cognitive and emotional benefits.
Mycelium
The vegetative part of a fungus, consisting of a network of fine white filaments that eventually produces mushrooms.