Substance use is the continued use of alcohol, illegal drugs, or the misuse of prescription or over-the-counter medicines with negative consequences. These consequences may involve:
- Problems at work, school, home or in interpersonal relationships
- Problems with the law
- Health problems
- Physical risks that come with using illegal drugs in dangerous situations
Substances that are commonly used include:
Alternative Names
Substance abuse; Illicit drug abuse; Narcotic abuse; Hallucinogen abuse
Review Date 7/17/2024
Updated by: Fred K. Berger, MD, addiction and forensic psychiatrist, Scripps Memorial Hospital, La Jolla, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.