Demulcent

A demulcent (derived from the Latin: demulcere "caress") is a mucilaginous or oleaginous preparation[1] that forms a soothing protective film over a mucous membrane, relieving minor pain and inflammation of the membrane.

Demulcents such as pectin, glycerin, honey, and syrup are common ingredients in cough mixtures and cough drops.

[4] Natural demulcents include slippery elm, pectin, licorice-root and marsh-mallow.

Synthetic demulcents include methylcellulose, propylene glycol, and glycerin.

Jaypee Brothers Medical Publishers.