Hallucinogens

LSD, psilocybin, mescaline and other hallucinogenic substances.

LSD

LSD effects, duration, testing, tolerance, bad trips, HPPD, interactions and safety resources.

Overview

LSD is a potent Schedule I psychedelic that alters perception, mood and time. Learn how acid works, how…

Withdrawal

LSD does not typically cause a classic physical withdrawal syndrome. Learn the difference between withdrawal, tolerance, a comedown,…

Drug testing

LSD has a plasma half-life of roughly 3 to 4 hours, while specialized testing can detect LSD metabolites…

Side effects

LSD can cause major perceptual changes, insomnia, increased heart rate, panic and paranoia. Learn common effects, bad trips,…

Addiction

LSD has low physical-dependence and compulsive-use potential, but rapid tolerance and problematic hallucinogen use can occur. Learn when…

Overdose

Severe LSD intoxication can cause prolonged psychedelic effects, panic, paranoia and unsafe behavior, while death from LSD itself…

Interaction

Alcohol does not reliably stop an LSD trip and may make judgment and impairment harder to recognize. Learn…

Comparison

LSD and psilocybin mushrooms are both classic psychedelics, but LSD generally lasts longer. Compare their effects, pharmacokinetics, tolerance,…

Identification

LSD can appear on blotter paper, in liquid, on sugar cubes or in small tablets, but appearance cannot…

Duration

LSD effects can last up to about 12 hours. Learn the usual onset, peak, trip duration, half-life, aftereffects…

Acute Psychological Risk

An LSD bad trip can involve intense panic, paranoia, confusion and unsafe behavior. Learn what a bad trip…

Persistent Effects

LSD flashbacks are brief recurrent perceptual experiences, while HPPD can cause persistent or recurrent visual disturbances that interfere…