The final rule, Requirements on Content and Format of Labeling for Human Prescription Drug and Biological Products, 71 FR 3922, was published on January 24, 2006. This rule is commonly referred to as the Physician Labeling Rule (PLR) because it addresses prescription drug labeling that is used by prescribers and other healthcare professionals. It was not until February 2013 that the Labeling for Human Prescription Drug and Biological Products - Implementing the PLR Content and Format Requirements was finalized. The PLR is intended to organize prescription drug information to make it easier for health care professionals to understand. Learn more about how to ensure pharmaceutical labels are safe and effective for the pediatric and geriatric population through the new guiding principles.