USMLE Step 3 Drug MOA Practice Test 2025 – Complete All-in-One Guide to Exam Mastery!

The mechanism of action for 5HT-2 antagonists involves blocking serotonin receptors. Specifically, these agents target the 5HT-2 subtype of serotonin receptors, which are primarily found in the brain and play a role in various physiological processes, including mood regulation, anxiety, and perception. By antagonizing these receptors, the drugs can counteract the overactivity of serotonin, which is implicated in conditions like anxiety and certain types of depression. This receptor blockade can lead to various therapeutic effects, such as anxiolytic properties or improvements in mood.

In contrast, the other options do not accurately describe the action of 5HT-2 antagonists. For instance, inhibiting serotonin release pertains to a different mechanism not associated with receptor antagonism. Enhancing dopamine release and agonizing norepinephrine pathways also describe actions related to other drug classes and do not align with the function of serotonin receptor antagonists.