What Is LSD?

LSD is a powerful, mind-altering drug that is sold illegally. Its full name is lysergic acid diethylamide. LSD is derived from the ergot fungus, which infects rye and other grains.

The drug is made in illegal laboratories, mostly in the United States. It is produced in crystal form and is turned into a liquid for distribution. LSD has no smell or color and tastes slightly bitter.

LSD, also known as acid, is sold in small tablets (microdots), capsules or gelatin squares (window panes). Sometimes it is put on absorbent paper, which is then divided into small squares decorated with designs or cartoon characters (blotters). Occasionally, it is sold as a liquid. No matter what form, LSD leads users to the same place—a serious disconnection from reality.

Users call the effects of LSD a trip, which typically lasts up to 12 hours. When an LSD experience turns negative, it is known as a bad trip—a term that describes the terrifying experience.

Updated: 2025