Glycilax for children rectal suppositories treat constipation, dry skin, skin disorders, and other ailments. Glycilax for children rectal suppositories can also be used for other purposes not mentioned in this drug guide. Glycerol is the active ingredient in Glycilax for Children Rectal Suppositories. Glycilax for children rectal suppositories operate by drawing water to the intestines, softening the feces.