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A demulcent (derived from the Latin: demulcere "caress") is an agent that supposedly forms a soothing film over a mucous membrane, relieving minor pain and inflammation of the membrane.[1][2] Demulcents are sometimes referred to as mucoprotective agents. Demulcents such as pectin, glycerin, honey, and syrup are common ingredients in cough mixtures and cough drops.[3][4] Methylcellulose, propylene glycol and glycerine are synthetic demulcents.


  1. ^ Mandel, I. D. (1987). "The Functions of Saliva". Journal of Dental Research. 66 (2 suppl): 623–627. doi:10.1177/00220345870660S203. ISSN 0022-0345. 
  2. ^ Frye, Rebecca, Justin Bailey, and Amy Blevins. "Which treatments provide the most relief for pharyngitis pain?." Clinical Inquiries, 2011 (MU) (2011).
  3. ^ Rouhi, Hamid, and Forouzan Ganji. "Effect of Althaea officinalis on cough associated with ACE inhibitors." Pakistan Journal of Nutrition 6.3 (2007): 256-258.
  4. ^ Boyd, Eldon M. (1952). "Cough medication and antihistaminic drugs.". Can Med Assoc J. 67 (4): 289–92. PMC 1822606Freely accessible. PMID 13009543.