Lysergic acid diethylamide, commonly known as LSD, and known colloquially as acid or lucy, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory per…Lysergic acid diethylamide, commonly known as LSD, and known colloquially as acid or lucy, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages, LSD manifests primarily mental, visual, and auditory hallucinations. Dilated pupils, increased blood pressure, and increased body temperature are typical.