A tiny tab of acid on the tongue – a daylong trip full of hallucinations and psychedelic experiences. For the first time, UNC School of Medicine researchers have discovered what the drug lysergic acid ...

LSD, also known as “acid,” is a drug that causes hallucinations and other effects lasting up to 12 hours. Just why LSD’s effects are so long-lasting has previously perplexed scientists, until now.

If you decide to drop acid, you’ll want to clear your schedule: A trip on lysergic acid diethylamide can last anywhere between six and 20 hours. Why acid trips last so long has been a mystery — until ...