Which of the following is NOT a requirement for the signature of a RPA on a prescription?

The correct answer identifies a component that is not required for the signature of a Registered Physician's Assistant (RPA) on a prescription. When a prescription is signed by an RPA, the essential elements typically involve clear identification of the RPA, which includes the written signature, the RPA's name (often stamped for clarity), and their DEA number if the prescription requires controlled substances.

The requirement for a patient's signature as backup is not mandated. Patients do not need to counter-sign or provide their signature in conjunction with the prescription written by the RPA; it is the professional responsibility of the RPA to ensure that the prescription is accurately composed and valid under the regulations. This highlights the independence of the prescriptive authority granted to RPAs under specific guidelines within pharmacy law. Thus, the absence of the patient's signature aligns with the focused role of the RPA in the prescribing process.