Partial agonist at D2, D3; high affinity for 5HT1A. Which medication fits this description?

Partial agonist at D2, D3; high affinity for 5HT1A. Which medication fits this description?

• A. Cariprazine
• B. Brexpiprazole
• C. Aripiprazole
• D. Clozapine

Answer: (A)

Partial agonism at both dopamine D2 and D3 receptors while also engaging 5-HT1A receptors describes a profile aimed at balancing antipsychotic effects with fewer motor side effects. Cariprazine fits this precisely because it is dopamine D3-prominent as a partial agonist at D2 and D3 and it also has high affinity as a 5-HT1A partial agonist. This strong D3 activity is a distinguishing feature, contributing to efficacy on negative symptoms and cognitive aspects while maintaining a favorable EPS profile. The other drugs either lack the pronounced D3 preference or rely on different receptor profiles (for example, clozapine acts mainly as a broad receptor antagonist, not a D2/D3 partial agonist). Brexpiprazole has a similar overall action but with less emphasis on D3 activity, making cariprazine the best fit for the described description.

Partial agonism at both dopamine D2 and D3 receptors while also engaging 5-HT1A receptors describes a profile aimed at balancing antipsychotic effects with fewer motor side effects. Cariprazine fits this precisely because it is dopamine D3-prominent as a partial agonist at D2 and D3 and it also has high affinity as a 5-HT1A partial agonist. This strong D3 activity is a distinguishing feature, contributing to efficacy on negative symptoms and cognitive aspects while maintaining a favorable EPS profile. The other drugs either lack the pronounced D3 preference or rely on different receptor profiles (for example, clozapine acts mainly as a broad receptor antagonist, not a D2/D3 partial agonist). Brexpiprazole has a similar overall action but with less emphasis on D3 activity, making cariprazine the best fit for the described description.