Final answer:
Risperidone (Risperdal) is the atypical antipsychotic agent with the highest risk for EPS and increased prolactin levels.
Step-by-step explanation:
The atypical antipsychotic agent with the highest risk for Extrapyramidal Symptoms (EPS) and increased prolactin is Risperidone (brand name: Risperdal). Risperidone is a dopamine antagonist that works by blocking dopamine receptors in the brain. By doing so, it can lead to side effects such as EPS (which include tremors, muscle stiffness, and restlessness) and an increase in prolactin levels, resulting in symptoms like breast enlargement and lactation.