Glycerin (Glycerinum, Glycerol) is a trivalent alcohol, part fats and many of lipids; CH2HE-NON-CH2IT. Colorless, viscous, hygroscopic liquid with a sweet taste. In medicine glycerine is used as an external tool to soften the skin and mucous membranes, usually mixed with water, alcohol or petroleum jelly and lanolin. Less glycerine is used as a laxative (2 to 5 ml in suppositories and enemas). In pharmaceutical practice glycerine is used as a basis for preparation of ointments, liniments, collodion, pills, vaginal suppositories, and other Glycerin is part of glycerin ointment (Unguentum Glycerini) and glycerin soap.