| Not Yet Recruiting | Psychosocial Factors in Dual Diagnosis in a General Hospital NCT07443033 | Hospital Virgen del Puerto | — |
| Not Yet Recruiting | VR Based Therapy to Treat Anxiety in Dual Diagnosis NCT06315660 | Mental Health Centre Sct. Hans | N/A |
| Recruiting | Building Social and Structural Connections for the Prevention of Opioid Use Disorder Among Youth Experiencing NCT06311838 | Ohio State University | N/A |
| Recruiting | CRP and S&A for Inpatient Veterans NCT05054738 | VA Office of Research and Development | N/A |
| Active Not Recruiting | Cannabidiol for Treatment of Non-affective Psychosis and Cannabis Use NCT04105231 | Lone Baandrup | Phase 2 |
| Completed | Group Motivational Interviewing (GMI) For Homeless Veterans In VA Services NCT02233738 | VA Office of Research and Development | N/A |
| Unknown | Trial of Supportive Text Messages for Patients With Alcohol Use Disorder and a Co-morbid Depression NCT02404662 | St Patrick's Hospital, Ireland | N/A |
| Completed | A Randomized Double-Blind Controlled Trial of Creatine in Female Methamphetamine Users NCT02192931 | Perry Renshaw | Phase 4 |
| Completed | Cannabis, Schizophrenia and Reward: Self-Medication and Agonist Treatment? NCT01964404 | Dartmouth-Hitchcock Medical Center | Phase 1 |
| Completed | Ondansetron for Bipolar Disorder and Alcohol Use Disorders NCT02082678 | University of Texas Southwestern Medical Center | Phase 4 |
| Completed | Clozapine for Cannabis Use in Schizophrenia NCT01639872 | Dartmouth-Hitchcock Medical Center | Phase 4 |
| Completed | Creatine as a Treatment Option for Depression in Methamphetamine Using Females NCT01514630 | Perry Renshaw | Phase 4 |
| Terminated | Open-Label Creatine Study for Female Meth Users NCT02189915 | Perry Renshaw | N/A |
| Completed | Risperidone and Desipramine in Alcohol Use and Schizophrenia NCT01411085 | Dartmouth-Hitchcock Medical Center | Phase 2 |
| Completed | Benefits Management for People With Psychiatric Disabilities NCT01329393 | Yale University | Phase 1 |
| Completed | Impact of Group Motivational Interviewing and In-Home-Messaging-Devices for Dually Diagnosed Veterans NCT00706901 | VA Office of Research and Development | N/A |
| Completed | Abstinence-Linked Money Management Multisite NCT01327586 | Yale University | Phase 2 |
| Completed | Cannabis and Schizophrenia: Self-Medication and Agonist Treatment NCT00946348 | Dartmouth-Hitchcock Medical Center | Phase 1 |
| Completed | Ostrobothnia Depression Study (ODS). A Naturalistic Follow-up Study on Depression and Related Substance Use Di NCT02520271 | Seinajoki Central Hospital | N/A |
| Completed | Dual-Diagnosis and Compulsory Treatment NCT00970372 | Sorlandet Hospital HF | — |
| Completed | Dual Diagnosis Self-Help Referral NCT00286728 | VA Office of Research and Development | N/A |
| Completed | Effectiveness of Self-Help for Dually-Diagnosed Persons - 1 NCT00218582 | National Institute on Drug Abuse (NIDA) | Phase 1 / Phase 2 |
| Completed | Effectiveness of Advisor-Teller Money Manager NCT00105768 | US Department of Veterans Affairs | Phase 1 / Phase 2 |
| Completed | Treatment of Schizophrenia and Comorbid Cannabis Use Disorder: Comparing Clozapine to Treatment-as-Usual NCT00498550 | Dartmouth-Hitchcock Medical Center | Phase 4 |
| Terminated | Alcoholism and Schizophrenia: Effects of Clozapine NCT00169026 | Dartmouth-Hitchcock Medical Center | Phase 4 |
| Completed | Matching, Outcomes and Costs in Substance Abuse/Psychiatric Treatment NCT00012727 | US Department of Veterans Affairs | Phase 2 |