The National Formulary is a reference book that provides a list of medicines and their formulations. It serves as a guide for healthcare professionals, ensuring they have access to standardized information about drugs, including their uses, dosages, and potential side effects. This helps maintain consistency in prescribing and dispensing medications. Originally published in the United States in 1888, the National Formulary is updated regularly to reflect new research and changes in medical practice. It complements the United States Pharmacopeia and is essential for pharmacists, doctors, and other healthcare providers in delivering safe and effective patient care.