Also "Horror Trip" - Occurrence of negative effects of hallucinogens, e.g. strong anxieties, also psychosomatic reactions such as heart lawn, swindle and others. For the process of the trips the so-called "setting" is crucial beside the personality of the consumer. Thus the tendency situation of the consumer before and during the Trips is meant as well as environmental factors.
According the WHO lexicon a bad trip in the user's jargon means "an adverse effect of drug use, consisting of any mixture of the following: feelings of losing control, distortions of body image, bizarre and frightening hallucinations, fears of insanity or death, despair, suicidal thoughts, and strong negative affect. Physical symptoms may include sweating, palpitations, nausea, and paraesthesias."