also known as a bad trip; a disturbing experience sometimes associated with use of a psychedelic drug such as LSD, Salvinorin A, DXM, mescaline, psilocybin, DMT and sometimes even other drugs including alcohol and MDMA. The manifestations can range from feelings of vague anxiety and alienation to profoundly disturbing states of unrelieved terror, ultimate entrapment, or cosmic annihilation. Psychedelic specialists in the therapeutic community do not necessarily consider unpleasant experiences as threatening or negative, focusing instead on their potential to be highly beneficial to the user when properly resolved. They can be exacerbated by the inexperience or irresponsibility of the user or the lack of proper preparation and environment for the trip, and are reflective of unresolved psychological tensions triggered during the course of the experience.
A multitude of reactions can occur during a psychedelic crisis. Some users may experience a general sense of fear or an anxiety attack. A user may be overwhelmed with the disconnection many psychedelics cause, and fear that they are going insane or will never return to reality. This can cause the user to fall into a depressive mood. Other reactions include an amplification of nameless fears; that is, fears that are unfounded and are usually not encountered in normality.