Final answer:
A Registered Pharmacist (RPH) does not need to sign an official prescription form; this is the responsibility of the prescribing healthcare professional. Pharmacists verify and dispense medication, not prescribe it.
Step-by-step explanation:
An official prescription form must be signed by the authorized healthcare provider who is legally permitted to write prescriptions, such as a physician, nurse practitioner, or other prescriber. The role of a Registered Pharmacist (RPH) is to verify the validity of the prescription, dispense the medication, provide consultation on its use, check for drug interactions, and manage the logistics within the pharmacy. A signature from an RHP on an RX form is not a common legal requirement for the validity of the prescription.
However, an RPH may provide a signature for record-keeping purposes within the pharmacy or to validate the completion of a prescription consultation or dispensing process. But, when it comes to the legal requirement of whose signature must be on the RX form for it to be considered valid and executable, it falls upon the prescriber, who is legally authorized to diagnose patients and prescribe medications for treatment.