The Psychiatric Characteristics of People on a Mephedrone ("bath salts") Binge.

: Despite solutions presented by the European Union and national regulations introduced by many countries, the problem of mephedrone (4-MMC) is growing. : The aim of this study was to investigate the effect of regular mephedrone intake with other psychoactive substances on the clinical picture of patients, including self-harms and suicide attempts. : The study involved a group of 601 patients addicted to mephedrone who were admitted to a psychiatric hospital between 2010 and 2018 due to regular mephedrone intake. : There was a statistically significant relationship between sleep disorders and mephedrone combined with alcohol ( < .05) or cannabinols ( < .05). However, the highest number of statistically significant correlations was reported when mephedrone was combined with opioids. There was a growing year-on-year percentage of people who attempted suicide because of regular mephedrone intake ( < .001). The more psychoactive substances were combined with mephedrone, the greater the risk of attempted suicide ( < .01). 20% of the examined group were hospitalized several times. Among those hospitalized several times, significantly more people took more than one additional psychoactive substance ( < .01). : The more psychoactive substances combined with mephedrone, the more clinical symptoms are associated with it.