Which of the following can a pharmacist add with authorization?

A pharmacist can add a DEA number to a prescription with proper authorization, as it is essential for ensuring compliance with federal and state regulations regarding controlled substances. Adding the DEA number helps in verifying that the prescription is legitimate and that the prescribing physician is authorized to prescribe controlled medications.

The other elements—patient's name, drug name, and date of the prescription—are typically critical components that should be clearly defined at the time of issuing a prescription. Modifying these without proper authority could lead to potential legal and ethical issues, making it crucial for pharmacists to adhere strictly to existing regulations and guidelines concerning the integrity of prescription information. Therefore, while some changes may require additional steps or authorizations, adding the DEA number is more permissible under established protocols.