Comorbidities of Major Depressive Disorder and Bipolar Disorders in Patients with Substance Use Disorder in Iran Psychiatric Hospital: A Cross-sectional Study.

Background: Mood disorders are the most common psychiatric comorbidities in substance users. Mood disorders and substance use disorders are 2 intertwined processes in which treating one aid in treating the other. Depression and substance use disorder are now regarded as major mental health issues due to their widespread incidence.