Hypersensitivity. Not to be used as primary therapy in patients w/ acute dysentery; acute ulcerative colitis; bacterial enterocolitis caused by invasive organisms including Salmonella, Shigella & Campylobacter; pseudomembranous colitis associated w/ the use of broad-spectrum antibiotics. Not be used when inhibition of peristalsis is to be avoided due to possible risk of significant sequelae including ileus, megacolon & toxic megacolon. Promptly discontinue when constipation, abdominal distension or ileus develops. Childn <12 yr.