Corrective excipients refer to pharmaceutical excipients used in medicines to improve or shield the bitter taste of the drug, making it difficult for patients to perceive the strong bitter taste of the drug (or other peculiar smells such as pungent, irritating, etc.). The substances added to the medicament to conceal and correct the bad smell of the medicament are called flavor correction and odor correction agent. Taste organs are the taste buds on the tongue, and olfactory organs are the olfactory cells in the nasal cavity. Flavor correction and odor correction are closely related to human taste and smell.