Finding that someone who was dependent on the opioid heroin required high doses of opioid replacement drug methadone would serve as an example of:
A) behavioral tolerance.
B) conditioned tolerance.
C) cross tolerance.
D) pharmacodynamic tolerance.

Question

Quizplus · Accepted Answer

Cross tolerance occurs when tolerance to one drug leads to a tolerance to another drug due to the drugs having a similar mechanism of action. In this case, the individual's dependence on heroin has led to a tolerance for opioids, including methadone.

Finding That Someone Who Was Dependent on the Opioid Heroin