The primary effects of LSD are to produce visual distortions, euphoria, and altered perceptions. This is referred to as a “good trip.” Experiencing these symptoms is often the reason why people take LSD in the first place. But, sometimes, an adverse reaction occurs.
Adverse effects of LSD can involve anxiety, panic attacks, depression, psychosis, and paranoia. This is referred to as a “bad trip.” Sometimes, a person can have a flashback to a “bad trip” and experience adverse mental health episodes even after the drug has been eliminated from their system.
Sometimes, a persisting visual hallucination can occur for hours, days, weeks, or even months after the drug has been eliminated from the system.