NCIt definition : A trihydroxyalcohol with localized osmotic diuretic and laxative effects. Glycerin
elevates the blood plasma osmolality thereby extracting water from tissues into interstitial
fluid and plasma. This agent also prevents water reabsorption in the proximal tubule
in the kidney leading to an increase in water and sodium excretion and a reduction
in blood volume. Administered rectally, glycerin exerts a hyperosmotic laxative effect
by attracting water into the rectum, thereby relieving constipation. In addition,
glycerin is used as a solvent, humectant and vehicle in various pharmaceutical preparations.;