How is tolerance defined in substance use?

Tolerance is defined as the need for increased amounts of a substance to achieve the same effect that was previously obtained with smaller doses. This phenomenon occurs when continuous use of a substance reduces its effectiveness, leading to the necessity of consuming larger quantities to experience the desired impact or high. It reflects the body's adaptation to the presence of the substance, which can significantly affect treatment approaches and understanding of an individual's substance use patterns.

This foundational concept is pivotal in assessing substance use disorders, as tolerance can indicate the progression of use and associated health risks. Recognizing tolerance helps clinicians tailor interventions and support strategies, ensuring they address the evolving nature of a client's substance use.