Which information is required by federal law to be included on a prescription label?

The correct information that federal law requires to be included on a prescription label is the prescription's expiration date. This is essential for ensuring that patients use their medications within a safe time frame to maintain efficacy and safety. Knowing the expiration date helps prevent the use of outdated medications, which could be ineffective or potentially harmful.

The prescribing doctor’s name is also typically included on a prescription label, as it identifies the healthcare provider responsible for the medication; however, it is not mandated by federal law to be specifically listed on the label in all jurisdictions. Patient insurance information, while important for billing and reimbursement purposes, is generally not included on a prescription label as it is more administrative in nature. Similarly, the pharmacist's name, while often included on pharmacy labels for accountability, is not a federal requirement. Thus, focusing on the prescription's expiration date highlights the critical element of ensuring safety and effective treatment for patients.