Final answer:
The statement is true; substituting medications during refills is part of managing ongoing therapy and requires prescribing authority.
Step-by-step explanation:
The statement that substituting at refills is considered managing ongoing therapy which requires additional prescribing authority is true. In the context of health care, managing ongoing therapy often involves making decisions about what medications a patient should continue taking, adjusting dosages, or substituting medications. This type of management is a part of prescribing authority, which must be granted to health care providers through legal and professional credentials. The act of substitution at the time of refills is a clinical decision that typically involves assessing the efficacy and safety of the current medication, as well as considering drug interactions, potential allergies, and patient preferences. This is not a role for someone without prescribing authority, as it could pose risks to patient safety.