How does acid/lsd effect someone neurologically and physically?

LSD: It is a hallucinogen. It alters your senses of time, space, & distance. U can hear colors or see sounds. The bad trip last @ 12 hours. Strange feelings & strong emotions are common. U can experience panic, confusion, sadness & scary images. It can affect your judgment & your behavior can get out of control. Your pupils dilate, your heart rate & blood pressure increase. You shake, sweat, can't sleep.

LSD: Biochemistry. Be careful you don't exacerbate an underlying condition in your brain that would provoke more hallucinations even when not taking LSD.