A pure opioid receptor antagonist:
A) cannot counteract an agonist for opioid receptors.
B) binds to all opioid receptors but only fails to activate one type of opioid receptor.
C) binds to but does not activate opioid receptors.
D) is unable to cross the blood-brain barrier.

Question

Quizplus · Accepted Answer

A pure opioid receptor antagonist binds to opioid receptors but does not activate them. It is used to reverse the effects of opioid agonists in overdose situations. Option A is incorrect because a pure opioid receptor antagonist can counteract an agonist for opioid receptors by blocking the agonist's effects. Option B is incorrect because a pure opioid receptor antagonist should not activate any type of opioid receptor. Option D is incorrect because pure opioid receptor antagonists can cross the blood-brain barrier.

A Pure Opioid Receptor Antagonist