Inactive substances, also known as excipients, are important components of pharmaceutical products. These are non-medicinal substances that are added to the active ingredient of the drug. Excipients play a significant role in the stability, bioavailability, and drug release properties of the medication. Some synonyms for inactive substances include inert ingredients, auxiliary substances, supporting agents, and vehicle materials. These components can be in the form of binders, fillers, coatings, flavors, and preservatives. It is essential to choose excipients carefully to ensure that they do not negatively affect the drug's therapeutic performance or cause adverse reactions. In summary, the right choice of inactive substances is crucial in the development and production of high-quality pharmaceutical products.