What limitation applies to the prescribing authority of certified nurse practitioners?

Certified nurse practitioners (CNPs) have prescribing authority that is typically governed by state law, which in Iowa requires them to operate under a collaborative practice agreement with a physician. This means that while they have the ability to prescribe medications, including controlled substances, their authority is not fully independent. The collaborative practice agreement outlines the scope of practice and ensures that CNPs work in tandem with physicians to provide comprehensive patient care.

In states where CNPs have full independent authority, they can prescribe without such agreements. However, in Iowa, this requirement emphasizes the importance of collaborative healthcare and ensures that there is oversight in prescribing practices, particularly for complex treatment plans. Thus, the correct answer highlights the reliance on collaboration between nurse practitioners and physicians in the state's healthcare framework.