LSD

Popularly known as acid, LSD is one of the most potent synthetic hallucinogens in the world.  In the short term, causes muscle weakness, change in the speed of reflexes, dilated pupils, incoordination of the limbs, distortion of time, space, and body image with perceptual intensification in all fields, strong emotional changes, and mystic sensations.

In the long run, may cause "flashbacks" which are characterized by visual, auditory, or tactile hallucinations similar to those of the original “trip” experiences, weeks, months or years later.

Psychotic episodes often occur with chronic use, accompanied by, abnormal thinking, and intense hallucinations similar to those of schizophrenia behaviors.