Investigating Cognitive Functions in Methadone Users in Comparison with Methadone and Methamphetamine Users and Control Group.

Background: Cognitive impairment in drug users is a marker for predicting recurrence and poorer adherence to treatment. The purpose of this study was to compare the cognitive function in three groups of methadone users methadone maintenance treatment (MMT), compared to methadone and methamphetamine (MAMP) users (MMT + MAMP) and healthy people (control group).

Methods: Three groups of 90 people including 30 users of MMT, 30 users of MMT + MAMP, and 30 healthy persons participated in this cross-sectional and purposeful study.