Pharmaceutical excipients refer to the excipients and additives used in the production of drugs and the preparation of prescriptions; they are substances, other than the active ingredient, that have undergone reasonable safety assessments and are included in pharmaceutical formulations. Besides acting as excipients, carriers, and improving stability, pharmaceutical excipients also have important functions such as solubilization, co-solubilization, and sustained-release, and are important components that may affect the quality, safety, and efficacy of drugs.