What does 'increased tolerance' mean?
Direct Answer
Increased tolerance refers to a physiological or psychological adaptation where a larger amount of a substance or a longer duration of an activity is required to achieve the same effect previously attained with less. It is a common phenomenon in various contexts, including medication use, substance consumption, and certain behaviors. This adaptation often develops over time with repeated exposure. It does not necessarily mean that an individual is addicted or has a substance use disorder.
Common Misunderstandings
["Increased tolerance means addiction. Correction: While increased tolerance is a criterion for substance use disorders, it can also occur with prescribed medications, like pain relievers, without indicating addiction. For example, a person taking a stable dose of a medication may require a higher dose to achieve the same therapeutic effect over time, which is tolerance.","Increased tolerance is solely a psychological issue. Correction: Increased tolerance involves both physiological and psychological adaptations. Physiologically, the body may become more efficient at metabolizing a substance or adapting neural pathways. Psychologically, an individual may habituate to a sensation or effect, requiring more to achieve the initial experience.","Tolerance is always undesirable. Correction: In some medical contexts, a degree of tolerance to certain side effects of medications can be beneficial if the primary therapeutic effect remains. For example, initial drowsiness from some medications may decrease over time, which can improve daily functioning for the patient."]
In Practice
In the context of substances, increased tolerance means a person using a substance needs more of it to feel the same effects they once did. For instance, an individual who drinks alcohol might find that they need more drinks to feel the same level of intoxication they used to experience with fewer drinks. This change reflects the body's adaptation to the substance. For medications, a patient might find that their initial prescribed dose no longer effectively manages symptoms, requiring their healthcare provider to adjust the dosage upwards to maintain therapeutic efficacy. This is a common occurrence with certain long-term medications.
What This Does NOT Mean
["This does not mean that tolerance is the sole indicator of a substance use disorder. A substance use disorder involves additional criteria, such as withdrawal, craving, inability to cut down, and continued use despite negative consequences.","This does not include the immediate, acute effects of a substance. Tolerance develops over time with repeated exposure, distinct from the immediate strength or dose of a substance affecting an individual for the first time.","This does not define the psychological state of craving or compulsion to use a substance. Tolerance is a physiological or psychological adaptation to ongoing exposure, not the drive to seek out and use the substance itself."]
Scope
This information is for reference purposes only and does not constitute professional medical, psychological, or addiction treatment advice.