The term “comorbidity” describes two or more disorders or illnesses occurring in the same person. They can occur at the same time or one after the other. Comorbidity also implies interactions between the illnesses that can worsen the course of both. Read the DrugFacts
Looking for Treatment?
Use the SAMHSA Treatment Locator or call 1-800-662-HELP (4357).
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Other Resources
- MEDLINEplus Health Information on Substance Use Disorders (National Library of Medicine, NIH)
- Healthfinder.gov (U.S. Department of Health and Human Services)
Clinical Trials
Clinical trials are research studies in human volunteers conducted to answer specific health questions. Learn about the NIH-sponsored clinical trials available to you.
- NIDA Clinical Trial Locator - answer a few simple questions and get contact information for Clinical Trials near you.
Related Resources
- NIDA COVID-19 Resources
- HHS: About the Multiple Chronic Conditions Initiative (U.S. Department of Health and Human Services)
- NIDA for Teens Drug Facts on Co-Occurring Conditions - Offers resources for teens and teen influencers. Get the latest on how drugs affect the brain and body. Features videos, games, blog posts, and more!
- Longitudinal Study of Adolescent Brain Cognitive Development (ABCD Study) (NIDA)
- Mental Health and Addiction Insurance Help (U.S. Department of Health and Human Services)
- First-Episode Psychosis and Co-Occurring Substance Use Disorders (SAMHSA)
- National Institute of Mental Health (NIMH)
- CDC - Federal Disaster Mental Health Resources