What information is NOT required on a prescription label for controlled substances?

The requirement for a prescription label for controlled substances is governed by federal and state regulations, which ensure clear communication of important information pertinent to the patient and the pharmacist. Among the necessary elements, the patient's name and address must be included to ensure the medication is dispensed to the correct individual and to maintain proper patient identification. The name of the prescriber is important for legal and verification purposes—it establishes who authorized the medication, which is crucial for both dispensing and patient safety. Additionally, directions for the use of the medication are essential so that the patient understands how to take the medication correctly, ensuring therapeutic effectiveness and minimizing the risk of misuse or errors.

On the other hand, including the fax number of the pharmacy is not mandated on the prescription label itself. While this information may be useful for other purposes, such as facilitating communication or refilling prescriptions, it is not a required element according to the regulations. Thus, the absence of the pharmacy's fax number on a controlled substance prescription label does not hinder the core purpose of the label, which is to provide critical information directly related to the patient's medication.