This article was co-authored by Natalia S. David, PsyD. Dr. David is an Assistant Professor in Psychology at the University of Texas Southwestern Medical Center and a Psychiatry Consultant at Clements University Hospital and at Zale Lipshy University Hospital. She is a member of the Board of Behavioral Sleep Medicine, the Academy for Integrative Pain Management, and the American Psychological Association’s Division of Health Psychology. In 2017, she received the Baylor Scott & White Research Institute’s Podium Presentation Award and scholarship. She received her PsyD from Alliant International University in 2017 with an emphasis in Health Psychology. This article has been viewed 75,256 times.

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If someone is using LSD, they'll likely seem disoriented, and they might not make sense when they talk depending on how much they've taken. They'll probably be experiencing hallucinations in one or more of their senses. If someone’s seeing or hearing things that aren’t there, it’s possible they’re on LSD. They may seem disorientated and experience time as much slower than it is. Depending on the dose of the drug and the stage of the trip, they may be uncoordinated and find it difficult to focus on basic tasks. They may also struggle to communicate what they’re experiencing and say things that don’t make sense to you. Like many other drugs, LSD will make user’s pupils dilate. If they’re having a “Bad trip,” they may also be paranoid and frightened. However, these symptoms are almost identical with psychosis, so it’s difficult to know for sure if someone’s on LSD. For more tips, including how to identify LSD blotters, read on!