Kerman University of Medical Sciences

Document Type: Original Article


1 PhD Candidate, Department of Health Psychology, School of Psychology, Karaj Branch, Islamic Azad University, Karaj AND Institute for Cognitive Science Studies, Brain and Cognition Clinic, Tehran, Iran

2 PhD Candidate, Department of Health Psychology, School of Psychology, Rudehen Branch, Islamic Azad University, Rudehen AND Institute for Cognitive Science Studies, Brain and Cognition Clinic, Tehran, Iran

3 Associate Professor, Department of Psychology, School of Social Sciences, Imam Khomeini International University, Qazvin, Iran

4 General Practitioner, Students Research Center of International Campus, Tehran University of Medical Sciences, Tehran, Iran

5 PhD Candidate, Department of Addiction Studies, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran

6 Assistant Professor, Department of Cognitive Rehabilitation, Institute for Cognitive Science Studies, Brain and Cognition Clinic, Tehran, Iran


Background: Drug craving, the main cause of relapse and a major motivator for drug use, is a challenging obstacle in substance use treatment. Transcranial direct current stimulation (tDCS), a non-invasive neuromodulatory technique, has shown promising outcomes in treating different neuropsychiatric disorders such as drug addiction, more specifically on drug craving. The aim in the current study was to examine the effects of applying tDCS on dorsolateral prefrontal cortex (DLPFC) in reducing drug cravings in former crystalline-heroin users enrolled in methadone maintenance (MMT) programs. Methods: The present study was a semi-experimental, crossover study with pre/post-test, and a control group. 40 right-handed men were selected from former crystalline-heroin users enrolled in MMT programs in Tehran, Iran. They were then divided into two matched groups based on age, education, and age of onset crystalline-heroin abuse. Desire for Drug Questionnaire (DDQ) was administered two times to all of the subjects, before first brain stimulation, and at the end of the last session. Experimental group received TDCS on DLPFC, and sham stimulation was applied on control subjects. The data were analyzed by analysis of covariance (ANCOVA) method using SPSS software. Findings: The study results indicated anodal tDCS over right and cathodal TDCS over left DLPFC, and in parallel with sham, significantly decreased drug cravings among former crystalline-heroin users (P < 0.050). Conclusion: This study showed that applying TDCS on DLPFC of former crystalline-heroin users reduces drug craving. The findings of this study expanded the results of previous studies on effects of this neuromodulatory technique for drug craving reduction in other drug type settings.


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