- Addiction is a complex condition, a brain disease that is manifested by compulsive substance use despite harmful consequences. People with addiction (severe substance use disorder) have an intense focus on using a certain substance(s), such as alcohol or drugs, to the point that it takes over their life. They keep using alcohol or a drug even when they know it will cause problems. Yet a number of effective treatments are available and people can recover from addiction and lead normal, productive lives.
- People with a substance use disorder have distorted thinking, behavior, and body functions. These substances can cause harmful changes in how the brain functions. These changes can last long after the immediate effects of the drug — the intoxication.