LSD, Lysergic acid diethylamide, also called colloquially as acid, is a hallucinogenic product. It effects typically include altered thoughts, feelings, and awareness of one’s surroundings. Many users see or hear things that do not exist. Dilated pupils, increased blood pressure, and increased body temperature are typical. It is used mainly as a recreational drug or for spiritual reasons.
LSD does not appear to be addictive, although tolerance may occur with use of increasing doses. Adverse psychiatric reactions are possible, such as anxiety, paranoia, and delusions. Distressing flashbacks might occur in spite of no further use, a condition called hallucinogen persisting perception disorder.