NCIt definition : A substance within a formulation that alters its thickness or texture to optimize
its administration.;
Alternative definition : PQCMC: Viscosity modifiers are designed to change the thickness or texture of pharmaceutical
ingredients. Viscosity modifiers can include such products as thickeners, texturizers,
gelation agents and stiffening agents (e.g. stiffening agent; thickener; thickening
agent; viscosity-increasing agent; firming agent). (Adapted from American Pharmaceutical
Review);