Flashbacks usually occur in people who use hallucinogens chronically or have an underlying personality problem however, otherwise healthy people who use LSD occasionally may also have flashbacks. A flashback occurs suddenly, often without warning, and may occur within a few days or more than a year after LSD use. Many LSD users experience flashbacks, recurrence of certain aspects of a person’s experience, without the user having taken the drug again. Some fatal accidents have occurred during states of LSD intoxication. Some LSD users experience severe, terrifying thoughts and feelings, fear of losing control, fear of insanity and death, and despair while using LSD.

Users refer to their experience with LSD as a “trip” and to acute adverse reactions as a “bad trip.” These experiences are long-typically they begin to clear after about 12 hours. These changes can be frightening and can cause panic. Sensations may seem to “cross over,” giving the user the feeling of hearing colors and seeing sounds. The user’s sense of time and self-changes. If taken in a large enough dose, the drug produces delusions and visual hallucinations.

The user may feel several different emotions at once or swing rapidly from one emotion to another. Sensations and feelings change much more dramatically than the physical signs. The physical effects include dilated pupils, higher body temperature, increased heart rate and blood pressure, sweating, loss of appetite, sleeplessness, dry mouth, and tremors. Usually, the user feels the first effects of the drug 30 to 90 minutes after taking it. They depend on the amount taken the user’s personality, mood, and expectations and the surroundings in which the drug is used.

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