Drug use refers to the consumption of legal or illegal substances that alter brain function and behavior. This includes prescription medications, over-the-counter drugs, and illicit substances.
While some drug use may be medically necessary or occasional, repeated use can lead to tolerance (needing more to achieve the same effect), dependence (physical or psychological need), and addiction (compulsive use despite harm).
Substance use disorder exists on a spectrum from mild to severe. Understanding the progression from use to addiction is crucial for early intervention and successful treatment.