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2D and 3D representation of the chemical structure of LSD
2D and 3D representation of the chemical structure of LSD

Lysergic acid diethylamide, commonly called LSD, or LSD-25, is a semisynthetic psychedelic drug. The short form LSD comes from the German "Lysergsäure-diethylamid".

The effects of LSD can vary greatly, depending on factors such as previous experiences, state of mind and environment, as well as dose strength. Generally, LSD causes expansion and altered experience of senses, emotions, memories, time, and awareness for 8 to 14 hours. In addition, LSD may produce visual effects such as moving geometric patterns, "trails" behind moving objects, and brilliant colors. LSD does not produce hallucinations in the strict sense but instead illusions and vivid daydream-like fantasies, in which ordinary objects and experiences can take on entirely different appearances or meanings. At higher doses it can cause synesthesia. The drug experience sometimes spurs long-term or even permanent changes in a user's personality and life perspective.

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