Targeting 5HT2A receptors is a characteristic of which pharmacologic action?

Targeting 5HT2A receptors is a characteristic of which pharmacologic action?

• A. Antagonists
• B. Partial agonists
• C. Agonists
• D. Inverse agonists

Answer: (A)

Blocking 5HT2A receptors is the action most characteristic of how many antipsychotics work. When a drug antagonizes 5-HT2A receptors, it dampens serotonin signaling at that site, which indirectly modulates dopamine pathways—typically increasing dopamine release in the prefrontal cortex. This helps improve aspects like motivation and cognition and tends to reduce extrapyramidal side effects compared with older drugs that primarily block D2 receptors. Activation of the receptor (an agonist) would have the opposite effect, and an inverse agonist would suppress even baseline activity, neither of which captures the common therapeutic action of these agents. The key idea is that 5HT2A antagonism is the pharmacologic action linked to this therapeutic effect.

Blocking 5HT2A receptors is the action most characteristic of how many antipsychotics work. When a drug antagonizes 5-HT2A receptors, it dampens serotonin signaling at that site, which indirectly modulates dopamine pathways—typically increasing dopamine release in the prefrontal cortex. This helps improve aspects like motivation and cognition and tends to reduce extrapyramidal side effects compared with older drugs that primarily block D2 receptors. Activation of the receptor (an agonist) would have the opposite effect, and an inverse agonist would suppress even baseline activity, neither of which captures the common therapeutic action of these agents. The key idea is that 5HT2A antagonism is the pharmacologic action linked to this therapeutic effect.