In one study,dental patients who were given a placebo reported increased pain when they were also injected with:

Question

Quizplus · Accepted Answer

Naloxone is an opioid antagonist that blocks the effects of endogenous opioids, such as enkephalins and endorphins, as well as exogenous opioids, such as morphine. Therefore, if dental patients who were given a placebo reported increased pain when injected with naloxone, it suggests that the placebo was somehow activating the release of endogenous opioids, which were then blocked by the naloxone.

In One Study,dental Patients Who Were Given a Placebo Reported