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  1. LSD - Wikipedia

    LSD is extremely potent, with noticeable effects at doses as low as 20 micrograms and is sometimes taken in much smaller amounts for microdosing. Despite widespread use, no fatal …

  2. 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.

  3. 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, …

  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 …

  5. 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 …

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

    Dec 31, 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 …

  7. LSD: The Bad and Potentially Good Sides - Psychology Today

    Sep 9, 2025 · LSD can trigger or exacerbate underlying psychiatric disorders, leading to psychosis, schizophrenia, or long-term hallucinations.

  8. LSD - Meaning, Effects & Facts | HISTORY

    Jun 14, 2017 · LSD, or lysergic acid diethylamide, is a hallucinogenic drug that was first synthesized a Swiss scientist in the 1930s. During the Cold War, the CIA conducted …

  9. LSD - Get Smart About Drugs

    Mar 17, 2025 · LSD What is it? Very strong hallucinogen sold on streets that is odorless and colorless with high potential for misuse.

  10. LSD (Lysergic acid diethylamide): Origins, types & effects

    Oct 24, 2022 · LSD, commonly known as acid, is the most potent hallucinogen yet discovered: a drug that induces lengthy psychedelic trips with visual disturbances, sensory distortion, …