Skip to main content
LSD causes the senses of space, distance, and time to become altered. People say they "hear" colors or "see" sounds, and have strange feelings and strong emotions.
Many users refer to an "acid trip" — when the effects don't let up and can last for up to 12 hours at a time. LSD also can cause "bad trips" — when users experience panic, confusion, sadness, and scary images. Bad reactions can occur with the first use and a user may have flashbacks later, experiencing the feelings of a bad trip even after the drug wears off.
Because LSD also affects judgment and behavior, users might find themselves in a dangerous situation.
Physical changes include increased heart rate and blood pressure, muscle twitches and shaking, dilated pupils, sweating, sleeplessness, and loss of appetite.
Reviewed by: Mary L. Gavin, MD
Date reviewed: September 2010
Originally reviewed by: Ryan L. Redman, MD
Note: All information is for educational purposes only. For specific medical advice, diagnoses and treatment, consult your doctor.
© 1995–2014 The Nemours Foundation/KidsHealth. All rights reserved.
Find out by selecting your child’s symptom or health condition in the list below:
Download Summer 2014 (PDF)
The 30th annual Miracle Makers fundraising special aired on KOMO 4 TV on June 6, 2014. The special takes us on a journey through the hopes, fears, victories and challenges facing patients at Seattle Children's. Cosponsored by Costco Wholesale and KOMO 4.
In the spirit of the holidays, patients, parents and doctors share inspirational stories of healing and hope. From surviving heart failure and a near-death drowning to battling a flesh-eating disease, witness how the impossible became possible thanks to the care patients received at Seattle Children's Hospital.
Miracle Season, hosted by Steve Pool and Molly Shen, aired Dec. 8, 2013, on KOMO 4 TV. The annual holiday special celebrates the remarkable lives of Seattle Children's patients.
Seattle Children’s provides healthcare without regard to race, color, religion (creed), sex, gender identity or expression, sexual orientation, national origin (ancestry) or disability. Financial assistance for medically necessary services is based on family income and hospital resources and is provided to children under age 21 whose primary residence is in Washington, Alaska, Montana or Idaho.
© 1995-2014 Seattle Children’s Hospital