A person who uses methamphetamine is at risk for psychotic episodes. According to McKetin et al the prevalence of psychosis in methamphetamine users is 11-fold greater than in the general population.
Risk factors for psychosis in a patient using methamphetamine:
(1) heavy and regular use, with further risk in someone who is dependent
(2) use of crystal methamphetamine or other high-potency formulations
(3) heavy and regular use of alcohol
(4) heavy and regular use of cannabis
(5) previous history of psychosis
Additional factors:
(6) lack of education beyond high school
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