Docusate is basically a detergent that is not absorbed by the body. It encourages the mixture of water and dietary fat within the stool, making the stool softer. It does not hold water like some bulking agents nor does it stimulate the bowel like true laxatives.Casanthranol is a stimulant type of laxative.ocusate is basically a detergent that is not absorbed by the body. It encourages the mixture of water and dietary fat within the stool, making the stool softer. It does not hold water like some bulking agents nor does it stimulate the bowel like true laxatives.