TOPICS: Laxatives, opiates, constipation, diarrhea, senna, stimulant laxatives, enteric nerves, melanosis coli, bulk forming laxatives, bulk formers, soluble fibers, bloating, psyllium, methylcellulose, osmotic laxatives, magnesium, magnesium citrate, magnesium hydroxide, polyethylene glycol, sorbitol, lactulose, ammonia, hepatic encephalopathy, dehydration, bulimics, emollients, stool softener, docusate, diarrhea