Tehran University of Medical Sciences Case Reports in Clinical Practice 2538-2683 5 4 2021 01 16 110 112 Reza Bidaki Department of Psychiatry, Research Center of Addicton and Behavioral Sciences, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran AND Diabetes Research Center, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran. Sina Negintaji Student Research Commitee, School of Pharmacy, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Mohammad Javad Dehqan Student Research Commitee, School of Pharmacy, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Fatemeh Saghafi Student Research Commitee, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Maryam Naseri Bafrouie Department of Medical Student, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Iran. Amir Mohammadi Student Research Commitee, School of Pharmacy, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. 2020 03 30 2020 05 05 Psychotic disorders are a group of severe mental disorders that can remarkably affect brain functions by altering beliefs and perceptions. There are different types of psychotic disorders, including schizophrenia, delusional disorder, paraphrenia, etc. The symptoms of a psychotic disorder include delusions, mood swings, difficulty concentrating, unusual behavior, altered feelings, and so on. Symptoms may vary from person to person and change with time. Antipsychotic drugs and psychotherapy can be used in the treatment of psychotic disorders. In this case report, we describe a 39-year-old woman who suffered from methamphetamine- induced delusional parasitosis. https://crcp.tums.ac.ir/index.php/crcp/article/view/345 https://crcp.tums.ac.ir/index.php/crcp/article/download/345/370