How do drugs change brain reward?
- By Robert Mauer
- Reviewed by: Dr. Janaka Hanvey, PhD
Drugs change brain reward by disrupting how the brain evaluates and responds to rewarding and meaningful experiences. Repeated use can shift the system so that the drug becomes more salient, while natural rewards become less impactful.
This involves changes across brain systems related to reward, learning, stress, and self-control. Over time, the balance shifts toward prioritizing the drug over other sources of reward.
As a result, behavior may become increasingly organized around drug use. The substance is no longer one option among many, but a dominant focus within the brain’s reward system.
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Sources
National Institute on Drug Abuse (NIDA) — Drugs, Brains, and Behavior: The Science of Addiction
Government scientific overview of drug use, addiction, brain changes, tolerance, dependence, and recovery.
National Institute on Drug Abuse (NIDA) — Commonly Used Drugs Charts
Comprehensive federal reference covering major drug categories, effects, overdose risks, and health consequences.
Substance Abuse and Mental Health Services Administration (SAMHSA) — Substance Use and Mental Health
Federal information about substance use, addiction, prevention, treatment, and behavioral health.
MedlinePlus — Drugs and Young People
Government medical resource discussing drug effects, misuse, addiction risks, and substance use education.
National Institute on Drug Abuse (NIDA) — Understanding Drug Use and Addiction DrugFacts
Clear explanation of why people use drugs, how addiction develops, and how substance use affects the brain and behavior.