What is LSD?

LSD (Lysergic acid diethyl-amide) , also known colloquially as acid, is a hallucinogenic drug. 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.
LSD belongs to a group of drugs known as psychedelics. When small doses are taken, it can produce mild changes in perception, mood and thought. Larger doses may produce visual hallucinations and distortions of space and time.

Effects typically begin within half an hour and can last for up to 12 hours. It is used mainly as a recreational drug or for spiritual reasons.