Dextromethorphan is a common ingredient in several over-the-counter cough medicines. Dextromethorphan in high doses can create a "high" with feelings of euphoria and hallucinations and has been abused. The reason for this effect is that dextromethorphan:
A) decreases inhibitory mechanisms.
B) is an N-methyl-D-aspartate agonist.
C) is an N-methyl-D-aspartate antagonist.
D) stimulates Aβ fibers (beta fibers).

Question

Quizplus · Accepted Answer

Dextromethorphan is an N-methyl-D-aspartate (NMDA) receptor antagonist, which can lead to dissociative effects and euphoria at high doses.

Dextromethorphan Is a Common Ingredient in Several Over-The-Counter Cough Medicines