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Definitions

Adjuvant: A substance added to a drug product formulation which affects the action of the active ingredient in a predictable way.  In immunology, a vehicle used to enhance antigenicity; eg a suspension of minerals on which antigen is adsorbed.

Diluent:  Ingredient in a medicinal preparation which lacks pharmacological activity but is pharmaceutically necessary or desirable. 

Excipient:  A substance in a vaccine other than the antigens, including adjuvants, preservatives, residual media,

 as a diluent or vehicle or to give form or consistency when the remedy is given in pill form; eg simple syrup, aromatic powder, honey, etc.

 

This page was last updated on June 09, 2016

2006 Institute for Vaccine Safety