Which of the following is not required on a prescription label for controlled substances?

The requirement for information on a prescription label for controlled substances is outlined in federal and state regulations to ensure patient safety and proper medication management. While the prescription label must clearly include various elements, the patient's date of birth is not considered a necessary component.

The date filled, Rx number, and directions for use are all critical pieces of information that help identify the specific medication, track when it was dispensed, and inform the patient on how to take the medication correctly. These elements serve practical purposes, such as ensuring the patient receives the right medication and dosage at the right time.

In contrast, while knowing a patient's date of birth can aid in verifying identity and avoiding drug interactions, it is not mandated to be included on a prescription label for controlled substances. This distinction helps streamline the labeling requirements without compromising safety and efficacy.