Evaluation of the Characteristics Associated With Methamphetamine Use in Patients With Heroin Use Disorder.

Objective: This study compared addiction severity, psychotic symptoms, suicide risk, and craving in patients with heroin use disorder, with and without methamphetamine use. We also investigated the reasons for methamphetamine use in these patients, and assessed 3-month clinical follow-up and treatment compliance. Methods: This cross-sectional study included 166 inpatients diagnosed with heroin use disorder (DSM-5). Patients were divided into two groups: heroin use only (H), and heroin use + methamphetamine use (H+M). Clinical assessments included the Addiction Profile Index-Clinical Form (API-C), Brief Psychiatric Rating Scale (BPRS), and Suicide Probability Scale (SPS). Statistical analyses were conducted with Statistical Package for the Social Sciences (SPSS) and included descriptive statistics, Kolmogorov-Smirnov test, Chi-square test, Mann-Whitney U test, and logistic regression. Three-month follow-up results and treatment compliance were compared between the two groups. Results: The H and H+M groups included 80 and 86 participants, respectively. The H+M group had higher BPRS total scores, API-C subscale scores (craving, risky behaviors, excitement-seeking, impulsiveness, depression), addiction severity, additional substance use, anxiety, depressive symptoms, suicidal ideation, and 3-month lapse rate. Craving and excitement-seeking were independent predictors of methamphetamine use. Conclusion: The H+M group showed more severe addiction, novelty-seeking personal characteristics, and suicidal ideation compared to the H group. Craving scores were higher in the H+M group and should not be overlooked, along with a greater risk of early lapse. Our study found that craving, risky behaviors, depressive and psychotic symptoms, and suicidal thoughts are the most critical issues to be addressed in the treatment and follow-up of the H+M patient group.