Any largely inert substance added to a drug to give suitable consistency or form to the drug.

A constituent of a medicine other than the active substance.

inactive part of drug (pop)

A component of a drug product other than the API, that is intentionally added to the dosage form to enable processing into patient friendly medicines, to control the rate at which the API dissolves from the dosage form, to aid drug stability and other reasons. For solid oral dosage forms, main classes of excipients include diluents or filler-binder [..]

Additives used in the preparation of the dosage form to either improve the handling and manufacturing of a product or to act as a filler (i.e., lactose, cellulose, starch, or dicalcium phosphate).

A more or less inert substance added in a prescription drug compound as a diluent or vehicle or to give form or consistency when the remedy is given in a pill form; simple syrup, aromatic powder, hone [..]

Any component of a finished dosage form other than an active ingredient (in some cases the distinction between an active ingredient and an excipient may not be clear cut, for example: sodium chloride used to adjust tonicity of an injection is an excipient).

An inert substance used to give a pharmaceutical preparation a suitable form or consistency.