Which piece of information about a patient can be changed on a C-II prescription?

The correct choice pertains to the patient's address on a C-II prescription. In the context of pharmacy law regarding controlled substances, particularly for Schedule II drugs, the information on the prescription is quite rigidly regulated to prevent misuse and ensure tracking.

The patient's address can be corrected or updated directly by the pharmacist, as it may sometimes be incorrect or require a change. This is permissible because it does not alter the intent of the prescription or the medication being prescribed. However, the correction must be noted appropriately in the pharmacy records to maintain compliance with regulatory standards.

In contrast, the patient’s name, the doctor’s name, and the prescriber’s signature are crucial elements of the prescription that cannot be altered. Changing the patient's name would alter who the prescription is intended for, thus endangering patient safety and accountability. Similarly, the doctor's name is fundamental because it identifies the prescriber, and cannot be altered without going through proper procedures, which may include issuing a new prescription. The prescriber’s signature is considered a legal authorization for the medication dispensed, and modifying it would nullify the validity of the prescription.

Therefore, only the patient’s address may be adjusted without disrupting the legal and clinical integrity of the C-II prescription.