Which piece of information is not required on a medication label?

The requirement of specific information on a medication label is guided by various regulations intended to ensure patient safety and proper medication management. A patient's social security number is not one of the mandatory elements that must be present on a medication label.

Including personal identification details like a social security number poses risks related to patient privacy and security. Regulations generally focus on ensuring that the relevant medication details are accessible to the patient and those administering the medication, such as the drug's name, the date the medication was filled, and identification from the pharmacist, represented by their initials. These elements are essential for accurate dispensing, patient information, and traceability within the pharmacy system. Therefore, the absence of a patient's social security number from a medication label aligns with privacy laws and regulations, making it the correct answer in this scenario.