In opioid use disorder, which concept refers to the need for higher doses to achieve the same effect?

In opioid use disorder, which concept refers to the need for higher doses to achieve the same effect?

• A. Addiction
• B. Tolerance
• C. Physical dependence
• D. Overdose

Answer: (B)

Tolerance is the phenomenon where repeated opioid exposure produces a progressively diminished effect, so a higher dose is required to achieve the same level of analgesia or euphoria. This happens because the body adapts to the drug through pharmacodynamic changes such as receptor desensitization and downregulation, and sometimes through increased metabolism that lowers drug levels in the bloodstream. In opioid use disorder, tolerance explains why individuals often escalate their dosing over time to recapture the same effect. It’s important to distinguish tolerance from physical dependence (withdrawal symptoms when the drug is stopped) and from addiction (a pattern of compulsive use despite harm). Overdose risk can rise when people dose higher than their tolerance, especially if other depressants are involved. Recognizing tolerance helps clinicians understand dose escalation and informs safe management, including strategies like medication-assisted therapy to address dependence and withdrawal.

Tolerance is the phenomenon where repeated opioid exposure produces a progressively diminished effect, so a higher dose is required to achieve the same level of analgesia or euphoria. This happens because the body adapts to the drug through pharmacodynamic changes such as receptor desensitization and downregulation, and sometimes through increased metabolism that lowers drug levels in the bloodstream. In opioid use disorder, tolerance explains why individuals often escalate their dosing over time to recapture the same effect. It’s important to distinguish tolerance from physical dependence (withdrawal symptoms when the drug is stopped) and from addiction (a pattern of compulsive use despite harm). Overdose risk can rise when people dose higher than their tolerance, especially if other depressants are involved. Recognizing tolerance helps clinicians understand dose escalation and informs safe management, including strategies like medication-assisted therapy to address dependence and withdrawal.