What does tolerance indicate in relation to drug use?

Tolerance is a critical concept in the context of substance use, indicating that as a person continues to use a drug over time, their body adapts to its effects. This adaptation manifests as an altered physiological state, where the individual requires larger doses of the drug to achieve the same effects that were previously experienced with smaller amounts. This phenomenon occurs because the body's neurochemical systems adjust to accommodate the drug's presence, resulting in diminished responsiveness.

Understanding tolerance is important in the treatment of substance use disorders, as it can lead to escalating use and increase the risk of dependency or overdose. For example, as individuals develop tolerance, they may believe they can handle larger amounts of the substance, which could ultimately be dangerous. Recognizing tolerance is vital for counselors in developing appropriate treatment plans and interventions for clients struggling with substance use.