The long-term pattern of maladaptive behavior caused by regular drug use is called:

• A. Intoxication
• B. Withdrawal
• C. Tolerance
• D. Substance use disorder

Answer: (D)

This item tests recognizing how a persistent, problematic pattern of drug use is categorized as a disorder. Substance use disorder is diagnosed when there is a long-term, maladaptive pattern of use that causes significant impairment or distress, often with ongoing issues like cravings, loss of control, neglect of responsibilities, and continued use despite problems. This contrasts with intoxication, which is the short-term effects while using; withdrawal, which are symptoms after stopping; and tolerance, which is needing more of the substance to achieve the same effect. So the long-term, disruptive pattern described fits substance use disorder.