The dosage level that will produce a hallucinogenic effect in humans generally is considered to be 25 micrograms. Over the past several years, the potency of LSD obtained during drug law enforcement operations has ranged between 20 and 80 micrograms per dosage unit. The Drug Enforcement Administration (DEA) recognizes 50 micrograms as the standard dosage unit equivalency.
LSD is classified as a Schedule I drug in the Controlled Substances Act of 1970. As a Schedule I drug, LSD meets the following three criteria: it is deemed to have a high potential for abuse; it has no legitimate medical use in treatment; and, there is a lack of accepted safety for its use under medical supervision.