what category is lsd
1 It is an illegal drug, but many of its physical effects are not 2  â¦. Negative Effects of LSD: Mental and Physical Lysergic acid diethylamide, known as LSD or acid, is a psychedelic drug well known for its strong effects. 3  Common effects of the drug include altered processes, closed and opâ¦.he effects of LSD strongly depend on the mental state of the user and the circumstances in which the drug is used. Therefore, the same dose can produce good and bad 'trips' in the same person, depending on the circumstances in which the drug is used.