Substances, other than the active ingredient, which have been appropriately evaluated for safety and are included in a drug delivery system to:a)Aid in the processing of the drug delivery system during its manufacture (diluent or vehicle).b)Protect, support or enhance stability, Bioavailability, or patient acceptability.c)Assist in product identification.d)Enhance any other attribute of the overall safety and effectiveness of the drug during storage or use.Simple syrup, aromatic powder, honey, and various elixirs are examples of excipients.