LSD was 1st created to be used as a blood stimulant

On April 16, 1943, Swiss chemist Albert Hofmann accidentally ingested LSD, a drug he had created with the intent of using as a blood stimulant. He later noted that it sent him into an "intoxicated-like condition characterised by an extremely stimulated imagination." LSD was banned in the US in 1960s-70s after it came to be used as a recreational drug.