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  1. LSD - Wikipedia

    LSD reduces oscillatory power in the brain's default mode network and flattens brain hierarchy. [22][23] At higher doses, it can induce visual and auditory hallucinations, ego dissolution, and anxiety. …

  2. LSD (Acid): Effects, Hazards & Extent of Use - Drugs.com

    LSD is synthetically made from lysergic acid, which is found in ergot, a fungus that grows on rye and other grains. It is so potent its doses tend to be in the microgram (mcg) range. It's effects, often …

  3. LSD | Definition, Psychological Effects, & Ergot Fungus | Britannica

    Nov 25, 2025 · LSD, potent synthetic hallucinogenic drug that can be derived from the ergot alkaloids of the fungus Claviceps purpurea. LSD is prepared by chemical synthesis in a laboratory.

  4. LSD: What to Know - WebMD

    LSD (lysergic acid diethylamide), also called “acid,” is a type of synthetic and mind-altering substance (psychedelic). This belongs to a class of drugs called hallucinogens. When you take LSD,...

  5. LSD - DEA.gov

    What is LSD? Lysergic acid diethylamide (LSD) is a potent hallucinogen that has a high potential for abuse and currently has no accepted medical use in treatment in the United States.

  6. LSD - Alcohol and Drug Foundation

    What is LSD? LSD (lysergic acid diethylamide) is a psychedelic drug, which means it can affect all senses, altering a person’s thinking, sense of time and emotions. Psychedelics can cause a person …

  7. Substance use - LSD: MedlinePlus Medical Encyclopedia

    LSD affects the action of a brain chemical called serotonin. Serotonin helps control behavior, mood, the senses, and thinking. LSD is in a class of drugs called hallucinogens. These are substances that …

  8. LSD Fast Facts - United States Department of Justice

    LSD (lysergic acid diethylamide) is a synthetic (man-made) drug that has been abused for its hallucinogenic properties since the 1960s. If consumed in a sufficiently large dose, LSD produces …

  9. LSD: Effects, Risks, Tips, and More - Healthline

    May 27, 2020 · Lucy, acid, dots — whatever you want to call it, LSD is one of the most well-known hallucinogens. Here's a look at what it feels like, the risks involved, and how to stay safe if you …

  10. We'll learn about LSD's potential for treating anxiety in 2026

    1 day ago · Two major trials investigating the potential of the psychedelic drug LSD for reducing anxiety are set to conclude in 2026. Scientists are feeling positive after the drug’s success in an earlier ...