In medicine, a cathartic is a substance that acceleratesdefecation. This is in contrast to a laxative, which is a substance which eases defecation, usually by softening feces. It is possible for a substance to be both a laxative and a cathartic. However, agents such as psyllium seed husks increase the bulk of the feces.
^American Academy Of Clinical Toxico; European Association Of Poisons Cen (2004). "Position paper: cathartics". Journal of Toxicology. Clinical Toxicology42 (3): 243–53. doi:10.1081/CLT-120039801. PMID15362590.
^Tamara McGregor et al (2009). "Evaluation and management of common childhood poisonings". Am Fam Physician79 (5): 397–403. PMID19275069.