An "acid trip" is the hallucinogenic experience that occurs after taking LSD (lysergic acid diethylamide). These "trips" vary from user to user and can last for up to 12-15 hours after taking the LSD dose. Individuals may experience visual and auditory hallucinations, body sensations, and varying extreme degrees of emotion.
For some individuals LSD use can result in serious and negative psychiatric reactions such as anxiety, paranoia, and delusions especially if too high of a dosage is taken. Although not addictive, LSD can be dangerous in that serious accidents can occur while in the hallucinogenic ally-altered state of mind if the person is in an unsafe or unsecured environment. Modern research is focusing on LSD usage as a psychological treatment in small dosages and its effectiveness in treating depression, anxiety, and addiction.