What does increased tolerance mean?
Direct Answer
Increased tolerance means that a person needs a higher amount of a substance to achieve the same effect previously reached with a smaller amount. This change develops over time with repeated exposure to the substance. It does not necessarily mean that physical dependence or addiction is present. Tolerance is a physiological adaptation.
Common Misunderstandings
["People sometimes believe that needing more of a substance automatically means they are addicted. Increased tolerance is a physiological adaptation; addiction involves compulsive use despite negative consequences and impaired control.","It is sometimes thought that tolerance indicates a 'strong' or healthy body. Tolerance means the body has adapted to the substance, not that it is unusually resilient or immune to harm from the substance.","It is sometimes assumed that tolerance develops at the same rate for all effects of a substance. Tolerance can develop at different rates for different effects. For example, tolerance to euphoric effects may increase faster than tolerance to respiratory depression."]
In Practice
If a substance previously produced a certain effect at a given amount, and now requires a larger amount to produce that identical effect, that is increased tolerance. This means the body's systems have adjusted. For example, if someone previously felt relaxed after one drink, and now requires two drinks for the same feeling of relaxation, tolerance has increased. This adjustment is a change in how the body processes or responds to the substance.
What This Does NOT Mean
["This does not mean that withdrawal symptoms will necessarily occur if substance use stops. Withdrawal is a separate physiological response.","This does not include situations where a substance's effect changes due to variations in the substance itself, or due to other external factors. Tolerance refers strictly to the body's repeated adaptation.","This does not mean that all individuals develop tolerance at the same rate or to the same degree. Tolerance development varies by individual, substance, and pattern of use."]
Scope
This information is for reference purposes only and does not constitute medical or professional advice.