Which agent has high affinity for D2 and D3, 5-HT1A, and 5-HT2A receptors?

Which agent has high affinity for D2 and D3, 5-HT1A, and 5-HT2A receptors?

• A. Aripiprazole
• B. Clozapine
• C. Olanzapine
• D. Ziprasidone

Answer: (A)

Focus on how a drug interacts with different receptors. A compound that binds strongly to D2 and D3 receptors and also engages 5-HT1A receptors while blocking 5-HT2A receptors fits aripiprazole’s distinctive profile. Aripiprazole acts as a partial agonist at D2 and D3, providing enough dopamine activity to prevent too much blockade (which reduces extrapyramidal symptoms) while dampening excessive dopaminergic signaling where needed. It also partially activates 5-HT1A, which can help with mood and negative symptoms, and it antagonizes 5-HT2A, supporting antipsychotic effects and metabolic safety. Other antipsychotics mainly emphasize D2 antagonism with strong 5-HT2A blockade and do not combine high D3 affinity with 5-HT1A partial agonism to the same extent. Ziprasidone, for instance, has notable 5-HT2A antagonism and some 5-HT1A activity but doesn’t pair that with the same high D3 affinity that aripiprazole offers. Thus, the described receptor pattern is most characteristic of aripiprazole.

Focus on how a drug interacts with different receptors. A compound that binds strongly to D2 and D3 receptors and also engages 5-HT1A receptors while blocking 5-HT2A receptors fits aripiprazole’s distinctive profile. Aripiprazole acts as a partial agonist at D2 and D3, providing enough dopamine activity to prevent too much blockade (which reduces extrapyramidal symptoms) while dampening excessive dopaminergic signaling where needed. It also partially activates 5-HT1A, which can help with mood and negative symptoms, and it antagonizes 5-HT2A, supporting antipsychotic effects and metabolic safety. Other antipsychotics mainly emphasize D2 antagonism with strong 5-HT2A blockade and do not combine high D3 affinity with 5-HT1A partial agonism to the same extent. Ziprasidone, for instance, has notable 5-HT2A antagonism and some 5-HT1A activity but doesn’t pair that with the same high D3 affinity that aripiprazole offers. Thus, the described receptor pattern is most characteristic of aripiprazole.