A pharmacopoeia is an official publication that contains a list of medicinal drugs and their specifications. It provides detailed information about the quality, strength, and purity of these substances, ensuring they meet safety standards for use in healthcare. Pharmacopoeias serve as essential references for pharmacists, healthcare professionals, and regulatory authorities. Each country may have its own pharmacopoeia, such as the United States Pharmacopeia (USP) or the British Pharmacopoeia (BP). These documents help standardize medications, making it easier to ensure that patients receive safe and effective treatments. Pharmacopoeias also include guidelines for the preparation and testing of drugs.