bulk cathartic

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1. causing emptying of the bowels.
2. an agent that so acts; called also evacuant and purgative.
3. producing emotional catharsis.
bulk cathartic one stimulating bowel evacuation by increasing fecal volume.
lubricant cathartic one that acts by softening the feces and reducing friction between them and the intestinal wall.
saline cathartic one that increases fluidity of intestinal contents by retention of water by osmotic forces, and indirectly increases motor activity.
stimulant cathartic one that directly increases motor activity of the intestinal tract.

bulk-forming laxative

Any laxative—e.g., psyllium, calcium polycarbophil, methylcellulose—which absorbs water and expands, increasing stool volume, facilitating passage of stools and increasing motility.