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LSD was first synthesized in 1938 and introduced as a drug in 1947 under the name Delysid to treat conditions like alcoholism and pain. It was believed to be useful for psychotherapy by unblocking repressed memories. However, possession of LSD was made illegal in the US in 1968. Chemically, LSD is similar to serotonin and its formula is C20H25N3O. It produces strong physical effects like increased blood pressure and psychological effects like altered senses and losing one's identity that can last up to 14 hours. While generally not dangerous, multiple uses can cause brain damage and flashbacks can occur months later.






