LSD

Table of Contents

Introduction References & Edit History Quick Facts & Related Topics

Images

For Students

Read Next

Man and woman with substance induced mental disorder or psychosis, hallucination, hallucinogens, lsd, drugs

Investigating Therapeutic Uses for Hallucinogens

Aspirin pills.

7 Drugs that Changed the World

Photo of the antacid Tums

How Do Antacids Work?

Opium. Opium poppy. Papaver somniferum. Seed. Spice. Poppy seed. Pile of poppy seeds.

Can Eating Poppy Seeds Make You Fail a Drug Test?

Drug syringe and cooked heroin on spoon

The U.S. Opioid Epidemic

Discover

Estimated battle casualties, Normandy invasion, World War II. WWII, D-Day

Estimated Battle Casualties During the Normandy Invasion and Campaign to Liberate Paris (June–August 1944)

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

Artist interpretation of space asteroids impacting earth and moon. Meteoroids, meteor impact, end of the world, danger, destruction, dinosaur extinct, Judgement Day, Doomsday Predictions, comet

Major Mass Extinctions

Normandy Invasion: Omaha Beach. World War II. D-Day. Infographic. SPOTLIGHT VERSION

Facts and Figures About the Landings on Omaha Beach During the Normandy Invasion on June 6, 1944

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Lake Mead (the impounded Colorado River) at the Hoover Dam. The light-coloured band of rock above the shoreline shows the decrease in water level in the first few years of the 21st century.

6 Lakes That Are Drying Up

LSD: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Last Updated: Jun 05, 2025

News •

Elusive LSD Fungus Finally Discovered on Flower • June 5, 2025, 3:39 AM ET (ScienceAlert)

Another drug haul linked to hotel management student • June 4, 2025, 2:21 AM ET (The Hindu)

Facts

Also Known As	d-lysergic acid diethylamide • lysergide • lysergic acid diethylamide

Photos

See All Images →

Topics

drug use psychedelic rock hallucinogen lysergic acid Schedule I drug heroin ketamine delta-8-THC Ecstasy diviner’s sage PCP ayahuasca psilocin mescaline bufotenine

Key People

Albert Hofmann

Albert Hofmann

Swiss chemist

Timothy Leary

Timothy Leary

American psychologist