This document discusses drugs used to treat constipation and diarrhea. For constipation, it describes laxatives that promote bowel evacuation, including bulk formers, stool softeners, and stimulant purgatives. For diarrhea, it outlines rehydration therapy and maintaining nutrition. Drug treatment includes specific antimicrobials, probiotics, drugs for inflammatory bowel disease, and nonspecific antidiarrheal drugs that are absorbents, antisecretory, or antimotility agents.