Which of the following can be changed on a C2 prescription without consulting the prescriber?

Changing a patient's address on a controlled substance prescription is permissible without consulting the prescriber, as this is generally considered a clerical change rather than a modification that affects the medication itself or the treatment plan. In practice, pharmacists can update the address to ensure accuracy in the record-keeping and to fulfill legal obligations related to the prescription's dispensing.

In contrast, altering other elements like the patient's name, medication dosage, or prescriber's signature could potentially lead to misuse, improper treatment, or legal issues. Changes to the patient's name may affect identity verification, altering the dosage could compromise patient safety, and modifying the prescriber's signature undermines the integrity of the prescription process. Therefore, these elements are safeguarded to maintain the authenticity and legality of controlled substance prescriptions, highlighting the importance of verifying such changes directly with the prescriber.