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Hallucinogens and Psychedelics01:27

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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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In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
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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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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
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Types of Toxins01:36

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
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Updated: Jan 18, 2026

Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation
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US Poison Center Encounters for Psilocybin-Related Exposures: 2013-2022.

Juan Carlos C Montoy1, Ralph C Wang1, Allison R Coker2,3

  • 1Department of Emergency Medicine, University of California, San Francisco, San Francisco, California, USA.

Journal of the American College of Emergency Physicians Open
|September 10, 2025
PubMed
Summary
This summary is machine-generated.

Psilocybin-related poison center encounters tripled from 2013 to 2022, with most increases occurring after 2019. This trend highlights potential risks associated with rising psilocybin use.

Keywords:
magic mushroomsmushroomspsilocybinpsychedelictoxicology

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Area of Science:

  • Toxicology
  • Public Health
  • Pharmacology

Background:

  • Increasing use of psilocybin-containing substances necessitates understanding associated risks.
  • Poison centers (PCs) are crucial for detecting, preventing, and treating toxin-related emergencies.
  • This study analyzes trends in PC encounters involving psilocybin and other substances.

Purpose of the Study:

  • To assess trends in poison center encounters related to psilocybin and comparator substances from 2013 to 2022.
  • To identify demographic patterns and clinical outcomes of psilocybin-related exposures.
  • To inform public health policy and healthcare provider guidance on psilocybin risks.

Main Methods:

  • Retrospective study of PC encounter data from 2013-2022.
  • Included exposures to psilocybin, other psychedelics (LSD, mescaline/peyote, hallucinogenic plants), and toxic plants/mushrooms.
  • Analyzed psilocybin-related encounters overall and by age group, noting co-ingestions and clinical outcomes.

Main Results:

  • 6,933 PC encounters for psilocybin substances (2013-2022).
  • Psilocybin encounters increased significantly over time (477 in 2013 to 1,441 in 2022).
  • Increases observed across all age groups, most common in 18-44 year-olds; similar to LSD/mescaline, lower than other mushrooms/plants.

Conclusions:

  • A threefold increase in psilocybin-related PC encounters occurred between 2013-2022, predominantly after 2019.
  • This trend contrasts with other substances and may continue with rising psilocybin use.
  • Understanding these trends is vital for public health, despite current low encounter numbers.