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Hallucinogens are psychoactive substances that profoundly alter perceptual experiences, generating unreal visual and sensory images. Often referred to as psychedelic drugs — a term derived from the Greek words "psyche" (mind) and "delos" (revealing) — these substances include marijuana and lysergic acid diethylamide (LSD), among others. These drugs vary in intensity and effects.
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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Hallucinogens, also known as psychedelic drugs, are a class of substances known for their ability to alter perception, cognition, and emotions. Despite their profound effects on the mind, these drugs are non-addictive, setting them apart from many other abused substances. The mechanism of action of these drugs lies in their impact on the 5-HT2A receptor in the brain. Upon activation, this receptor couples to Gq-type G proteins, triggering a cascade that releases intracellular calcium. This...
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Traumatic Psychedelic Experiences.

Abigail E Calder1, Vincent J Diehl1, Gregor Hasler2,3

  • 1Molecular Psychiatry Laboratory, Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland.

Current Topics in Behavioral Neurosciences
|April 29, 2025
PubMed
Summary
This summary is machine-generated.

Traumatic psychedelic experiences, though rare, can cause lasting psychological distress. Understanding their causes and implementing preventative measures is crucial for minimizing harm and promoting recovery.

Keywords:
Acute stress disorderAdverse effectsPost-traumatic growthPost-traumatic stress disorderPost-trip difficultiesTrauma-related symptomsTraumatic psychedelic experiences

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Area of Science:

  • Psychopharmacology and Psychiatry
  • Trauma Studies

Background:

  • Psychedelic substances can induce profound psychological experiences, some of which may be intensely negative.
  • Challenging psychedelic experiences can manifest as extreme fear, helplessness, and perceived threats, leading to potential trauma.

Purpose of the Study:

  • To explore the causes, characteristics, and consequences of traumatic psychedelic experiences.
  • To provide guidance on prevention and mitigation strategies for negative outcomes.

Main Methods:

  • Literature review and synthesis of existing research on psychedelic-induced trauma.
  • Analysis of phenomenological accounts and clinical observations.

Main Results:

  • Traumatic psychedelic experiences stem from factors like drug effects, unsafe environments, and pre-existing trauma.
  • Symptoms can include prolonged anxiety, sleep disturbances, and derealization, mimicking post-traumatic stress.

Conclusions:

  • Traumatic psychedelic experiences are a significant, yet preventable, risk associated with psychedelic use.
  • Proactive prevention and supportive interventions are essential for individuals undergoing challenging psychedelic experiences.