Somayeh abedi - Ma of psychology, allameh tabatabai university
ahmad borjali - professor of allameh tabatabai university
ezzatolah kurdmirza - assistant professor of alborz payame noor university

Objective: This study is devoted to a relationship between irrational beliefs and severity of addiction in methadone treatment addicts in shahrood city, Iran. Method: the research was conducted between 56 addicts that was in treatment with methadone. They were selected with using Simple random sampling method then evaluated by Irrational Beliefs Test (IBT) and and severity of addiction Semi-structured interviews (ASI). Results: findings showed positive and significant relationship between total score of irrational beliefs and severity of addiction. the entire beliefs, These relationship was significant in: Anxious over concern (PA), Despondency (D), helplessness changes (HC),but relationship was not significant in: demand for approval (DA), high self-expectation (HSE), Blame proneness (BP), Frustration reactive (FR), emotional irresponsibility (EI), problem avoiding (PA),perfectionism (P). Conclusion: training and identifying irrational beliefs have a significant effect on reducing severity of addiction. This finding suggest that to reduce severity of addiction and prevention of social harms and treatment of addiction, irrational beliefs must be modified

irrational beliefs, severity of addiction